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

Ext.util.CSS = function() {
	var D = null;
	var C = document;
	var B = /(-[a-z])/gi;
	var A = function(E, F) {
		return F.charAt(1).toUpperCase()
	};
	return {
		createStyleSheet : function(G, J) {
			var F;
			var E = C.getElementsByTagName("head")[0];
			var I = C.createElement("style");
			I.setAttribute("type", "text/css");
			if (J) {
				I.setAttribute("id", J)
			}
			if (Ext.isIE) {
				E.appendChild(I);
				F = I.styleSheet;
				F.cssText = G
			} else {
				try {
					I.appendChild(C.createTextNode(G))
				} catch (H) {
					I.cssText = G
				}
				E.appendChild(I);
				F = I.styleSheet
						? I.styleSheet
						: (I.sheet || C.styleSheets[C.styleSheets.length - 1])
			}
			this.cacheStyleSheet(F);
			return F
		},
		removeStyleSheet : function(F) {
			var E = C.getElementById(F);
			if (E) {
				E.parentNode.removeChild(E)
			}
		},
		swapStyleSheet : function(G, E) {
			this.removeStyleSheet(G);
			var F = C.createElement("link");
			F.setAttribute("rel", "stylesheet");
			F.setAttribute("type", "text/css");
			F.setAttribute("id", G);
			F.setAttribute("href", E);
			C.getElementsByTagName("head")[0].appendChild(F)
		},
		refreshCache : function() {
			return this.getRules(true)
		},
		cacheStyleSheet : function(F) {
			if (!D) {
				D = {}
			}
			try {
				var H = F.cssRules || F.rules;
				for (var E = H.length - 1; E >= 0; --E) {
					D[H[E].selectorText] = H[E]
				}
			} catch (G) {
			}
		},
		getRules : function(F) {
			if (D == null || F) {
				D = {};
				var H = C.styleSheets;
				for (var G = 0, E = H.length; G < E; G++) {
					try {
						this.cacheStyleSheet(H[G])
					} catch (I) {
					}
				}
			}
			return D
		},
		getRule : function(E, G) {
			var F = this.getRules(G);
			if (!(E instanceof Array)) {
				return F[E]
			}
			for (var H = 0; H < E.length; H++) {
				if (F[E[H]]) {
					return F[E[H]]
				}
			}
			return null
		},
		updateRule : function(E, H, G) {
			if (!(E instanceof Array)) {
				var I = this.getRule(E);
				if (I) {
					I.style[H.replace(B, A)] = G;
					return true
				}
			} else {
				for (var F = 0; F < E.length; F++) {
					if (this.updateRule(E[F], H, G)) {
						return true
					}
				}
			}
			return false
		}
	}
}();