var XMLHttpReq;
var currentSort;
// ����XMLHttpRequest����
function createXMLHttpRequest() {
	if (window.XMLHttpRequest) {
		XMLHttpReq = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		try {
			XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
			}
		}
	}
}
// ����������
function sendRequest(url) {
	createXMLHttpRequest();
	XMLHttpReq.open("GET", url, true);
	XMLHttpReq.onreadystatechange = processResponse;
	XMLHttpReq.send(null);
}
// ���?����Ϣ����
function processResponse() {
	if (XMLHttpReq.readyState == 4) {
		if (XMLHttpReq.status == 200) {
			updateMenu();
		} else {
			alert("���������ҳ�����쳣��");
		}
	}
}

/**
 * @gettype :all ���б����ֶ� constant ֻȡ�����ֶ� date ֻȡ���������ֶ� text
 *          ������ͨ�����ı���¼����ֶ�
 */
function getTable(obj, selectName, gettype) {
	if (obj.value == "")
		return;
	var strA = "";
	createXMLHttpRequest();
	axo = new ActiveXObject("Microsoft.XMLDOM");
	XMLHttpReq.open("POST", "getAttributeXml.jsp?classid=" + obj.getValue()
					+ "&gettype=" + gettype, false);
	XMLHttpReq.setRequestHeader("Content-Length", strA.length);
	XMLHttpReq.setRequestHeader("Content-type",
			"application/x-www-form-urlencoded");
	XMLHttpReq.send(strA);
	axo.loadXML(XMLHttpReq.responseText);
	n1 = axo.selectNodes("/root/name");
	n2 = axo.selectNodes("/root/description");

	BuildSel(unescape(XMLHttpReq.responseText), selectName, n1, n2);
}

function BuildSel(str, sel, id, name) {
	sel.options.length = 0;
	if (id.length == 0) {
		sel.options[sel.options.length] = new Option('')
		return;
	}
	var arrstr = new Array();
	arrstr = str.split(",");
	sel.options[sel.options.length] = new Option('-��ѡ��-');
	// ��ʼ�����µ�Select.
	for (var i = 0; i < id.length; i++) {
		sel.options[sel.options.length] = new Option(name(i).text, id(i).text);
	}
}