/*
 * Ext JS Library 2.0 Copyright(c) 2006-2007, Ext JS, LLC. licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/*
 * Copyright (c) 2007, Yahoo! Inc. All rights reserved. Code licensed under the
 * BSD License: http://developer.yahoo.net/yui/license.txt version: 2.2.0
 */
/*
 * Copyright (c) 2006, Yahoo! Inc. All rights reserved. Code licensed under the
 * BSD License: http://developer.yahoo.net/yui/license.txt
 */

/**
 * The dom module provides helper methods for manipulating Dom elements.
 * 
 * @module dom
 * 
 */

(function() {
	var Y = YAHOO.util, // internal shorthand
	getStyle, // for load time browser branching
	setStyle, // ditto
	id_counter = 0, // for use with generateId
	propertyCache = {}; // for faster hyphen converts

	// brower detection
	var ua = navigator.userAgent.toLowerCase(), isOpera = (ua.indexOf('opera') > -1), isSafari = (ua
			.indexOf('safari') > -1), isGecko = (!isOpera && !isSafari && ua
			.indexOf('gecko') > -1), isIE = (!isOpera && ua.indexOf('msie') > -1);

	// regex cache
	var patterns = {
		HYPHEN : /(-[a-z])/i
	};

	var toCamel = function(property) {
		if (!patterns.HYPHEN.test(property)) {
			return property; // no hyphens
		}

		if (propertyCache[property]) { // already converted
			return propertyCache[property];
		}

		while (patterns.HYPHEN.exec(property)) {
			property = property.replace(RegExp.$1, RegExp.$1.substr(1)
							.toUpperCase());
		}

		propertyCache[property] = property;
		return property;
		// return property.replace(/-([a-z])/gi, function(m0, m1) {return
		// m1.toUpperCase()}) // cant use function as 2nd arg yet due to safari
		// bug
	};

	// branching at load instead of runtime
	if (document.defaultView && document.defaultView.getComputedStyle) { // W3C
																			// DOM
																			// method
		getStyle = function(el, property) {
			var value = null;

			var computed = document.defaultView.getComputedStyle(el, '');
			if (computed) { // test computed before touching for safari
				value = computed[toCamel(property)];
			}

			return el.style[property] || value;
		};
	} else if (document.documentElement.currentStyle && isIE) { // IE method
		getStyle = function(el, property) {
			switch (toCamel(property)) {
				case 'opacity' :// IE opacity uses filter
					var val = 100;
					try { // will error if no DXImageTransform
						val = el.filters['DXImageTransform.Microsoft.Alpha'].opacity;

					} catch (e) {
						try { // make sure its in the document
							val = el.filters('alpha').opacity;
						} catch (e) {
						}
					}
					return val / 100;
					break;
				default :
					// test currentStyle before touching
					var value = el.currentStyle
							? el.currentStyle[property]
							: null;
					return (el.style[property] || value);
			}
		};
	} else { // default to inline only
		getStyle = function(el, property) {
			return el.style[property];
		};
	}

	if (isIE) {
		setStyle = function(el, property, val) {
			switch (property) {
				case 'opacity' :
					if (typeof el.style.filter == 'string') { // in case not
																// appended
						el.style.filter = 'alpha(opacity=' + val * 100 + ')';

						if (!el.currentStyle || !el.currentStyle.hasLayout) {
							el.style.zoom = 1; // when no layout or cant tell
						}
					}
					break;
				default :
					el.style[property] = val;
			}
		};
	} else {
		setStyle = function(el, property, val) {
			el.style[property] = val;
		};
	}

	/**
	 * Provides helper methods for DOM elements.
	 * 
	 * @namespace YAHOO.util
	 * @class Dom
	 */
	YAHOO.util.Dom = {
		/**
		 * Returns an HTMLElement reference.
		 * 
		 * @method get
		 * @param {String |
		 *            HTMLElement |Array} el Accepts a string to use as an ID
		 *            for getting a DOM reference, an actual DOM reference, or
		 *            an Array of IDs and/or HTMLElements.
		 * @return {HTMLElement | Array} A DOM reference to an HTML element or
		 *         an array of HTMLElements.
		 */
		get : function(el) {
			if (!el) {
				return null;
			} // nothing to work with

			if (typeof el != 'string' && !(el instanceof Array)) { // assuming
																	// HTMLElement
																	// or
																	// HTMLCollection,
																	// so pass
																	// back as
																	// is
				return el;
			}

			if (typeof el == 'string') { // ID
				return document.getElementById(el);
			} else { // array of ID's and/or elements
				var collection = [];
				for (var i = 0, len = el.length; i < len; ++i) {
					collection[collection.length] = Y.Dom.get(el[i]);
				}

				return collection;
			}

			return null; // safety, should never happen
		},

		/**
		 * Normalizes currentStyle and ComputedStyle.
		 * 
		 * @method getStyle
		 * @param {String |
		 *            HTMLElement |Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements.
		 * @param {String}
		 *            property The style property whose value is returned.
		 * @return {String | Array} The current value of the style property for
		 *         the element(s).
		 */
		getStyle : function(el, property) {
			property = toCamel(property);

			var f = function(element) {
				return getStyle(element, property);
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Wrapper for setting style properties of HTMLElements. Normalizes
		 * "opacity" across modern browsers.
		 * 
		 * @method setStyle
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements.
		 * @param {String}
		 *            property The style property to be set.
		 * @param {String}
		 *            val The value to apply to the given property.
		 */
		setStyle : function(el, property, val) {
			property = toCamel(property);

			var f = function(element) {
				setStyle(element, property, val);

			};

			Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Gets the current position of an element based on page coordinates.
		 * Element must be part of the DOM tree to have page coordinates
		 * (display:none or elements not appended return false).
		 * 
		 * @method getXY
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements
		 * @return {Array} The XY position of the element(s)
		 */
		getXY : function(el) {
			var f = function(el) {

				// has to be part of document to have pageXY
				if (el.parentNode === null || el.offsetParent === null
						|| this.getStyle(el, 'display') == 'none') {
					return false;
				}

				var parentNode = null;
				var pos = [];
				var box;

				if (el.getBoundingClientRect) { // IE
					box = el.getBoundingClientRect();
					var doc = document;
					if (!this.inDocument(el) && parent.document != document) {// might
																				// be
																				// in a
																				// frame,
																				// need
																				// to
																				// get
																				// its
																				// scroll
						doc = parent.document;

						if (!this.isAncestor(doc.documentElement, el)) {
							return false;
						}

					}

					var scrollTop = Math.max(doc.documentElement.scrollTop,
							doc.body.scrollTop);
					var scrollLeft = Math.max(doc.documentElement.scrollLeft,
							doc.body.scrollLeft);

					return [box.left + scrollLeft, box.top + scrollTop];
				} else { // safari, opera, & gecko
					pos = [el.offsetLeft, el.offsetTop];
					parentNode = el.offsetParent;
					if (parentNode != el) {
						while (parentNode) {
							pos[0] += parentNode.offsetLeft;
							pos[1] += parentNode.offsetTop;
							parentNode = parentNode.offsetParent;
						}
					}
					if (isSafari && this.getStyle(el, 'position') == 'absolute') { // safari
																					// doubles
																					// in
																					// some
																					// cases
						pos[0] -= document.body.offsetLeft;
						pos[1] -= document.body.offsetTop;
					}
				}

				if (el.parentNode) {
					parentNode = el.parentNode;
				} else {
					parentNode = null;
				}

				while (parentNode && parentNode.tagName.toUpperCase() != 'BODY'
						&& parentNode.tagName.toUpperCase() != 'HTML') { // account
																			// for
																			// any
																			// scrolled
																			// ancestors
					if (Y.Dom.getStyle(parentNode, 'display') != 'inline') { // work
																				// around
																				// opera
																				// inline
																				// scrollLeft/Top
																				// bug
						pos[0] -= parentNode.scrollLeft;
						pos[1] -= parentNode.scrollTop;
					}

					if (parentNode.parentNode) {
						parentNode = parentNode.parentNode;
					} else {
						parentNode = null;
					}
				}

				return pos;
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Gets the current X position of an element based on page coordinates.
		 * The element must be part of the DOM tree to have page coordinates
		 * (display:none or elements not appended return false).
		 * 
		 * @method getX
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements
		 * @return {String | Array} The X position of the element(s)
		 */
		getX : function(el) {
			var f = function(el) {
				return Y.Dom.getXY(el)[0];
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Gets the current Y position of an element based on page coordinates.
		 * Element must be part of the DOM tree to have page coordinates
		 * (display:none or elements not appended return false).
		 * 
		 * @method getY
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements
		 * @return {String | Array} The Y position of the element(s)
		 */
		getY : function(el) {
			var f = function(el) {
				return Y.Dom.getXY(el)[1];
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Set the position of an html element in page coordinates, regardless
		 * of how the element is positioned. The element(s) must be part of the
		 * DOM tree to have page coordinates (display:none or elements not
		 * appended return false).
		 * 
		 * @method setXY
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements
		 * @param {Array}
		 *            pos Contains X & Y values for new position (coordinates
		 *            are page-based)
		 * @param {Boolean}
		 *            noRetry By default we try and set the position a second
		 *            time if the first fails
		 */
		setXY : function(el, pos, noRetry) {
			var f = function(el) {
				var style_pos = this.getStyle(el, 'position');
				if (style_pos == 'static') { // default to relative
					this.setStyle(el, 'position', 'relative');
					style_pos = 'relative';
				}

				var pageXY = this.getXY(el);
				if (pageXY === false) { // has to be part of doc to have pageXY
					return false;
				}

				var delta = [ // assuming pixels; if not we will have to retry
				parseInt(this.getStyle(el, 'left'), 10),
						parseInt(this.getStyle(el, 'top'), 10)];

				if (isNaN(delta[0])) {// in case of 'auto'
					delta[0] = (style_pos == 'relative') ? 0 : el.offsetLeft;
				}
				if (isNaN(delta[1])) { // in case of 'auto'
					delta[1] = (style_pos == 'relative') ? 0 : el.offsetTop;
				}

				if (pos[0] !== null) {
					el.style.left = pos[0] - pageXY[0] + delta[0] + 'px';
				}
				if (pos[1] !== null) {
					el.style.top = pos[1] - pageXY[1] + delta[1] + 'px';
				}

				if (!noRetry) {
					var newXY = this.getXY(el);

					// if retry is true, try one more time if we miss
					if ((pos[0] !== null && newXY[0] != pos[0])
							|| (pos[1] !== null && newXY[1] != pos[1])) {
						this.setXY(el, pos, true);
					}
				}

			};

			Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Set the X position of an html element in page coordinates, regardless
		 * of how the element is positioned. The element must be part of the DOM
		 * tree to have page coordinates (display:none or elements not appended
		 * return false).
		 * 
		 * @method setX
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements.
		 * @param {Int}
		 *            x The value to use as the X coordinate for the element(s).
		 */
		setX : function(el, x) {
			Y.Dom.setXY(el, [x, null]);
		},

		/**
		 * Set the Y position of an html element in page coordinates, regardless
		 * of how the element is positioned. The element must be part of the DOM
		 * tree to have page coordinates (display:none or elements not appended
		 * return false).
		 * 
		 * @method setY
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements.
		 * @param {Int}
		 *            x To use as the Y coordinate for the element(s).
		 */
		setY : function(el, y) {
			Y.Dom.setXY(el, [null, y]);
		},

		/**
		 * Returns the region position of the given element. The element must be
		 * part of the DOM tree to have a region (display:none or elements not
		 * appended return false).
		 * 
		 * @method getRegion
		 * @param {String |
		 *            HTMLElement | Array} el Accepts a string to use as an ID,
		 *            an actual DOM reference, or an Array of IDs and/or
		 *            HTMLElements.
		 * @return {Region | Array} A Region or array of Region instances
		 *         containing "top, left, bottom, right" member data.
		 */
		getRegion : function(el) {
			var f = function(el) {
				var region = new Y.Region.getRegion(el);
				return region;
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Returns the width of the client (viewport).
		 * 
		 * @method getClientWidth
		 * @deprecated Now using getViewportWidth. This interface left intact
		 *             for back compat.
		 * @return {Int} The width of the viewable area of the page.
		 */
		getClientWidth : function() {
			return Y.Dom.getViewportWidth();
		},

		/**
		 * Returns the height of the client (viewport).
		 * 
		 * @method getClientHeight
		 * @deprecated Now using getViewportHeight. This interface left intact
		 *             for back compat.
		 * @return {Int} The height of the viewable area of the page.
		 */
		getClientHeight : function() {
			return Y.Dom.getViewportHeight();
		},

		/**
		 * Returns a array of HTMLElements with the given class. For optimized
		 * performance, include a tag and/or root node when possible.
		 * 
		 * @method getElementsByClassName
		 * @param {String}
		 *            className The class name to match against
		 * @param {String}
		 *            tag (optional) The tag name of the elements being
		 *            collected
		 * @param {String |
		 *            HTMLElement} root (optional) The HTMLElement or an ID to
		 *            use as the starting point
		 * @return {Array} An array of elements that have the given class name
		 */
		getElementsByClassName : function(className, tag, root) {
			var method = function(el) {
				return Y.Dom.hasClass(el, className);
			};
			return Y.Dom.getElementsBy(method, tag, root);
		},

		/**
		 * Determines whether an HTMLElement has the given className.
		 * 
		 * @method hasClass
		 * @param {String |
		 *            HTMLElement | Array} el The element or collection to test
		 * @param {String}
		 *            className the class name to search for
		 * @return {Boolean | Array} A boolean value or array of boolean values
		 */
		hasClass : function(el, className) {
			var re = new RegExp('(?:^|\\s+)' + className + '(?:\\s+|$)');

			var f = function(el) {
				return re.test(el['className']);
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Adds a class name to a given element or collection of elements.
		 * 
		 * @method addClass
		 * @param {String |
		 *            HTMLElement | Array} el The element or collection to add
		 *            the class to
		 * @param {String}
		 *            className the class name to add to the class attribute
		 */
		addClass : function(el, className) {
			var f = function(el) {
				if (this.hasClass(el, className)) {
					return;
				} // already present

				el['className'] = [el['className'], className].join(' ');
			};

			Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Removes a class name from a given element or collection of elements.
		 * 
		 * @method removeClass
		 * @param {String |
		 *            HTMLElement | Array} el The element or collection to
		 *            remove the class from
		 * @param {String}
		 *            className the class name to remove from the class
		 *            attribute
		 */
		removeClass : function(el, className) {
			var re = new RegExp('(?:^|\\s+)' + className + '(?:\\s+|$)', 'g');

			var f = function(el) {
				if (!this.hasClass(el, className)) {
					return;
				} // not present

				var c = el['className'];
				el['className'] = c.replace(re, ' ');
				if (this.hasClass(el, className)) { // in case of multiple
													// adjacent
					this.removeClass(el, className);
				}

			};

			Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Replace a class with another class for a given element or collection
		 * of elements. If no oldClassName is present, the newClassName is
		 * simply added.
		 * 
		 * @method replaceClass
		 * @param {String |
		 *            HTMLElement | Array} el The element or collection to
		 *            remove the class from
		 * @param {String}
		 *            oldClassName the class name to be replaced
		 * @param {String}
		 *            newClassName the class name that will be replacing the old
		 *            class name
		 */
		replaceClass : function(el, oldClassName, newClassName) {
			if (oldClassName === newClassName) { // avoid infinite loop
				return false;
			}

			var re = new RegExp('(?:^|\\s+)' + oldClassName + '(?:\\s+|$)', 'g');

			var f = function(el) {

				if (!this.hasClass(el, oldClassName)) {
					this.addClass(el, newClassName); // just add it if
														// nothing to replace
					return; // note return
				}

				el['className'] = el['className'].replace(re, ' '
								+ newClassName + ' ');

				if (this.hasClass(el, oldClassName)) { // in case of multiple
														// adjacent
					this.replaceClass(el, oldClassName, newClassName);
				}
			};

			Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Generates a unique ID
		 * 
		 * @method generateId
		 * @param {String |
		 *            HTMLElement | Array} el (optional) An optional element
		 *            array of elements to add an ID to (no ID is added if one
		 *            is already present).
		 * @param {String}
		 *            prefix (optional) an optional prefix to use (defaults to
		 *            "yui-gen").
		 * @return {String | Array} The generated ID, or array of generated IDs
		 *         (or original ID if already present on an element)
		 */
		generateId : function(el, prefix) {
			prefix = prefix || 'yui-gen';
			el = el || {};

			var f = function(el) {
				if (el) {
					el = Y.Dom.get(el);
				} else {
					el = {}; // just generating ID in this case
				}

				if (!el.id) {
					el.id = prefix + id_counter++;
				} // dont override existing

				return el.id;
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Determines whether an HTMLElement is an ancestor of another HTML
		 * element in the DOM hierarchy.
		 * 
		 * @method isAncestor
		 * @param {String |
		 *            HTMLElement} haystack The possible ancestor
		 * @param {String |
		 *            HTMLElement} needle The possible descendent
		 * @return {Boolean} Whether or not the haystack is an ancestor of
		 *         needle
		 */
		isAncestor : function(haystack, needle) {
			haystack = Y.Dom.get(haystack);
			if (!haystack || !needle) {
				return false;
			}

			var f = function(needle) {
				if (haystack.contains && !isSafari) { // safari "contains" is
														// broken
					return haystack.contains(needle);
				} else if (haystack.compareDocumentPosition) {
					return !!(haystack.compareDocumentPosition(needle) & 16);
				} else { // loop up and test each parent
					var parent = needle.parentNode;

					while (parent) {
						if (parent == haystack) {
							return true;
						} else if (!parent.tagName
								|| parent.tagName.toUpperCase() == 'HTML') {
							return false;
						}

						parent = parent.parentNode;
					}
					return false;
				}
			};

			return Y.Dom.batch(needle, f, Y.Dom, true);
		},

		/**
		 * Determines whether an HTMLElement is present in the current document.
		 * 
		 * @method inDocument
		 * @param {String |
		 *            HTMLElement} el The element to search for
		 * @return {Boolean} Whether or not the element is present in the
		 *         current document
		 */
		inDocument : function(el) {
			var f = function(el) {
				return this.isAncestor(document.documentElement, el);
			};

			return Y.Dom.batch(el, f, Y.Dom, true);
		},

		/**
		 * Returns a array of HTMLElements that pass the test applied by
		 * supplied boolean method. For optimized performance, include a tag
		 * and/or root node when possible.
		 * 
		 * @method getElementsBy
		 * @param {Function}
		 *            method - A boolean method for testing elements which
		 *            receives the element as its only argument.
		 * 
		 * @param {String}
		 *            tag (optional) The tag name of the elements being
		 *            collected
		 * @param {String |
		 *            HTMLElement} root (optional) The HTMLElement or an ID to
		 *            use as the starting point
		 * @return {Array} Array of HTMLElements
		 */
		getElementsBy : function(method, tag, root) {
			tag = tag || '*';

			var nodes = [];

			if (root) {
				root = Y.Dom.get(root);
				if (!root) { // if no root node, then no children
					return nodes;
				}
			} else {
				root = document;
			}

			var elements = root.getElementsByTagName(tag);

			if (!elements.length && (tag == '*' && root.all)) {
				elements = root.all; // IE < 6
			}

			for (var i = 0, len = elements.length; i < len; ++i) {
				if (method(elements[i])) {
					nodes[nodes.length] = elements[i];
				}
			}

			return nodes;
		},

		/**
		 * Returns an array of elements that have had the supplied method
		 * applied. The method is called with the element(s) as the first arg,
		 * and the optional param as the second ( method(el, o) ).
		 * 
		 * @method batch
		 * @param {String |
		 *            HTMLElement | Array} el (optional) An element or array of
		 *            elements to apply the method to
		 * @param {Function}
		 *            method The method to apply to the element(s)
		 * @param {Any}
		 *            o (optional) An optional arg that is passed to the
		 *            supplied method
		 * @param {Boolean}
		 *            override (optional) Whether or not to override the scope
		 *            of "method" with "o"
		 * @return {HTMLElement | Array} The element(s) with the method applied
		 */
		batch : function(el, method, o, override) {
			var id = el;
			el = Y.Dom.get(el);

			var scope = (override) ? o : window;

			if (!el || el.tagName || !el.length) { // is null or not a
													// collection (tagName for
													// SELECT and others that
													// can be both an element
													// and a collection)
				if (!el) {
					return false;
				}
				return method.call(scope, el, o);
			}

			var collection = [];

			for (var i = 0, len = el.length; i < len; ++i) {
				if (!el[i]) {
					id = el[i];
				}
				collection[collection.length] = method.call(scope, el[i], o);
			}

			return collection;
		},

		/**
		 * Returns the height of the document.
		 * 
		 * @method getDocumentHeight
		 * @return {Int} The height of the actual document (which includes the
		 *         body and its margin).
		 */
		getDocumentHeight : function() {
			var scrollHeight = (document.compatMode != 'CSS1Compat')
					? document.body.scrollHeight
					: document.documentElement.scrollHeight;

			var h = Math.max(scrollHeight, Y.Dom.getViewportHeight());
			return h;
		},

		/**
		 * Returns the width of the document.
		 * 
		 * @method getDocumentWidth
		 * @return {Int} The width of the actual document (which includes the
		 *         body and its margin).
		 */
		getDocumentWidth : function() {
			var scrollWidth = (document.compatMode != 'CSS1Compat')
					? document.body.scrollWidth
					: document.documentElement.scrollWidth;
			var w = Math.max(scrollWidth, Y.Dom.getViewportWidth());
			return w;
		},

		/**
		 * Returns the current height of the viewport.
		 * 
		 * @method getViewportHeight
		 * @return {Int} The height of the viewable area of the page (excludes
		 *         scrollbars).
		 */
		getViewportHeight : function() {
			var height = self.innerHeight; // Safari, Opera
			var mode = document.compatMode;

			if ((mode || isIE) && !isOpera) { // IE, Gecko
				height = (mode == 'CSS1Compat')
						? document.documentElement.clientHeight
						: // Standards
						document.body.clientHeight; // Quirks
			}

			return height;
		},

		/**
		 * Returns the current width of the viewport.
		 * 
		 * @method getViewportWidth
		 * @return {Int} The width of the viewable area of the page (excludes
		 *         scrollbars).
		 */

		getViewportWidth : function() {
			var width = self.innerWidth; // Safari
			var mode = document.compatMode;

			if (mode || isIE) { // IE, Gecko, Opera
				width = (mode == 'CSS1Compat')
						? document.documentElement.clientWidth
						: // Standards
						document.body.clientWidth; // Quirks
			}
			return width;
		}
	};
})();
/**
 * A region is a representation of an object on a grid. It is defined by the
 * top, right, bottom, left extents, so is rectangular by default. If other
 * shapes are required, this class could be extended to support it.
 * 
 * @namespace YAHOO.util
 * @class Region
 * @param {Int}
 *            t the top extent
 * @param {Int}
 *            r the right extent
 * @param {Int}
 *            b the bottom extent
 * @param {Int}
 *            l the left extent
 * @constructor
 */
YAHOO.util.Region = function(t, r, b, l) {

	/**
	 * The region's top extent
	 * 
	 * @property top
	 * @type Int
	 */
	this.top = t;

	/**
	 * The region's top extent as index, for symmetry with set/getXY
	 * 
	 * @property 1
	 * @type Int
	 */
	this[1] = t;

	/**
	 * The region's right extent
	 * 
	 * @property right
	 * @type int
	 */
	this.right = r;

	/**
	 * The region's bottom extent
	 * 
	 * @property bottom
	 * @type Int
	 */
	this.bottom = b;

	/**
	 * The region's left extent
	 * 
	 * @property left
	 * @type Int
	 */
	this.left = l;

	/**
	 * The region's left extent as index, for symmetry with set/getXY
	 * 
	 * @property 0
	 * @type Int
	 */
	this[0] = l;
};

/**
 * Returns true if this region contains the region passed in
 * 
 * @method contains
 * @param {Region}
 *            region The region to evaluate
 * @return {Boolean} True if the region is contained with this region, else
 *         false
 */
YAHOO.util.Region.prototype.contains = function(region) {
	return (region.left >= this.left && region.right <= this.right
			&& region.top >= this.top && region.bottom <= this.bottom);

};

/**
 * Returns the area of the region
 * 
 * @method getArea
 * @return {Int} the region's area
 */
YAHOO.util.Region.prototype.getArea = function() {
	return ((this.bottom - this.top) * (this.right - this.left));
};

/**
 * Returns the region where the passed in region overlaps with this one
 * 
 * @method intersect
 * @param {Region}
 *            region The region that intersects
 * @return {Region} The overlap region, or null if there is no overlap
 */
YAHOO.util.Region.prototype.intersect = function(region) {
	var t = Math.max(this.top, region.top);
	var r = Math.min(this.right, region.right);
	var b = Math.min(this.bottom, region.bottom);
	var l = Math.max(this.left, region.left);

	if (b >= t && r >= l) {
		return new YAHOO.util.Region(t, r, b, l);
	} else {
		return null;
	}
};

/**
 * Returns the region representing the smallest region that can contain both the
 * passed in region and this region.
 * 
 * @method union
 * @param {Region}
 *            region The region that to create the union with
 * @return {Region} The union region
 */
YAHOO.util.Region.prototype.union = function(region) {
	var t = Math.min(this.top, region.top);
	var r = Math.max(this.right, region.right);
	var b = Math.max(this.bottom, region.bottom);
	var l = Math.min(this.left, region.left);

	return new YAHOO.util.Region(t, r, b, l);
};

/**
 * toString
 * 
 * @method toString
 * @return string the region properties
 */
YAHOO.util.Region.prototype.toString = function() {
	return ("Region {" + "top: " + this.top + ", right: " + this.right
			+ ", bottom: " + this.bottom + ", left: " + this.left + "}");
};

/**
 * Returns a region that is occupied by the DOM element
 * 
 * @method getRegion
 * @param {HTMLElement}
 *            el The element
 * @return {Region} The region that the element occupies
 * @static
 */
YAHOO.util.Region.getRegion = function(el) {
	var p = YAHOO.util.Dom.getXY(el);

	var t = p[1];
	var r = p[0] + el.offsetWidth;
	var b = p[1] + el.offsetHeight;
	var l = p[0];

	return new YAHOO.util.Region(t, r, b, l);
};

// ///////////////////////////////////////////////////////////////////////////

/**
 * A point is a region that is special in that it represents a single point on
 * the grid.
 * 
 * @namespace YAHOO.util
 * @class Point
 * @param {Int}
 *            x The X position of the point
 * @param {Int}
 *            y The Y position of the point
 * @constructor
 * @extends YAHOO.util.Region
 */
YAHOO.util.Point = function(x, y) {
	if (x instanceof Array) { // accept output from Dom.getXY
		y = x[1];
		x = x[0];
	}

	/**
	 * The X position of the point, which is also the right, left and index zero
	 * (for Dom.getXY symmetry)
	 * 
	 * @property x
	 * @type Int
	 */

	this.x = this.right = this.left = this[0] = x;

	/**
	 * The Y position of the point, which is also the top, bottom and index one
	 * (for Dom.getXY symmetry)
	 * 
	 * @property y
	 * @type Int
	 */
	this.y = this.top = this.bottom = this[1] = y;
};

YAHOO.util.Point.prototype = new YAHOO.util.Region();

YAHOO.register("dom", YAHOO.util.Dom, {
			version : "2.2.0",
			build : "127"
		});