function httpRequest(method, data, URL) {

	var Http = null;
	try {
		Http = new ActiveXObject("Msxml2.XMLHTTP");
	} catch(e) {
		try {
			Http = new ActiveXObject("Microsoft.XMLHTTP");
		} catch(oc) {
			Http = null;
		}
	}
	if (!Http && window.XMLHttpRequest) {
		Http = new XMLHttpRequest();
	}
	if (Http == null) {
		alert("Your browser cannot handle this script,you can try IE or Firefox.");
	}
	Http.open(method, URL, false);
	Http.send(data);
	var response = Http.responseText;
	delete(Http);
	return response;
}

function XMLDatastore() {
	//类变量
	var xmlDoc;
	var errorInfo;
	var listOfNodes;

	//类方法
	this.init = init;
	this.createNew = createNew;
	this.loadFile = loadFile;
	this.loadXML = loadXML;
	this.rowCount = rowCount;
	this.colCount = colCount;
	this.getItem = getItem;
	this.getItemByName = getItemByName;
	this.insertRow = insertRow;
	this.addColumn = addColumn;
	this.setItem = setItem;
	this.setItemByName = setItemByName;
	this.getXML = getXML;
	this.getErrorInfo = getErrorInfo;
	this.destroy = destroy;

	function init() {
		// code for IE
		if (window.ActiveXObject) {
			xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
			xmlDoc.async = false;
		}
		// code for Mozilla, Firefox, Opera, etc.
		else if (document.implementation && document.implementation.createDocument) {
			xmlDoc = document.implementation.createDocument('', '', null);
			xmlDoc.async = false;
		} else {
			alert('Your browser cannot handle this script,you can try IE or Firefox.');
		}

	}

	function createNew() {
		root = xmlDoc.createElement("rows");
		xmlDoc.appendChild(root);
		listOfNodes = xmlDoc.documentElement.childNodes;
	}

	function loadFile(fileName) {
		var result = false;

		xmlDoc.load(fileName);

		root = xmlDoc.getElementsByTagName(xmlDoc.childNodes[0].tagName)[0];
		if (root.childNodes[1] == null) {
			listOfNodes = xmlDoc.documentElement.childNodes;
		} else {
			listOfNodes = root.getElementsByTagName(root.childNodes[1].tagName);
		}
		result = true;
		return result;
	}

	function loadXML(xml) {
		var result = false;
		if (navigator.appName.indexOf("Internet Explorer") == -1) {
			var parser = new DOMParser();
			xmlDoc = parser.parseFromString(xml, "text/xml");
			if (xmlDoc.documentElement) {
				result = true;
				listOfNodes = xmlDoc.documentElement.childNodes;
			}
		} else {
			xmlDoc.loadXML(xml);
			if (xmlDoc.parseError != 0) errorInfo = xmlDoc.parseError.reason;
			else {
				result = true;
				listOfNodes = xmlDoc.documentElement.childNodes;
			}
		}

		return result;
	}

	function rowCount() {
		return listOfNodes.length;
	}

	function colCount() {
		var cols = 0;

		if (rowCount() > 0) cols = listOfNodes.item(0).childNodes.length;

		return cols;
	}

	function getItem(rowNo, colNo) {
		var node = listOfNodes.item(rowNo);
		node = node.childNodes.item(colNo);

		return node.text;
	}

	function getItemByName(rowNo, colName) {
		var node = listOfNodes.item(rowNo);
		var rowNodes = node.childNodes;
		var i;
		for (i = 0; i < rowNodes.length; i++) {
			node = rowNodes.item(i);
			if (node.tagName == colName) {
				if (node.text != undefined) {
					return node.text;
				} else {
					return node.textContent;
				}
			}
		}

	}

	function insertRow(rowNo) {
		var rowElement = xmlDoc.createElement("row");

		if (rowNo == -1) {
			xmlDoc.documentElement.appendChild(rowElement);
			rowNo = rowCount();
		} else {
			xmlDoc.documentElement.insertBefore(rowElement, listOfNodes.item(rowNo));
		}

		return rowNo;
	}

	function addColumn(rowNo, colName, value) {
		var colElement = xmlDoc.createElement(colName);
		var node = listOfNodes.item(rowNo);
		node.appendChild(colElement);
		node.lastChild.text = value;
	}

	function setItem(rowNo, colNo, value) {
		var node = listOfNodes.item(rowNo);
		node = node.childNodes.item(colNo);

		return node.text = value;
	}

	function setItemByName(rowNo, colName, value) {
		var listOfCols = xmlDoc.documentElement.getElementsByTagName(colName);
		var node = listOfCols.item(rowNo);

		return node.text = value;
	}

	function getXML() {
		/*if (window.XSLTProcessor) {
   // transformToDocument方式
   var xsltProcessor = new XSLTProcessor();
   //xmlDoc.load("../XmlFile/Common.xsl");
   xsltProcessor.importStylesheet("../XmlFile/Common.xsl");
   var result = xsltProcessor.transformToDocument(xmlDoc);
   var xmls = new XMLSerializer();
   return xmls.serializeToString(result);
  }
  else {
   return xmlDoc.transformNode(xmlDoc);
  }*/
		var xmlstr = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
		xmlstr += "<rows>";
		for (i = 0; i < listOfNodes.length; i++) {
			xmlstr += "<row>";
			rowNodes = listOfNodes.item(i).childNodes;
			for (j = 0; j < rowNodes.length; j++) {
				node = rowNodes.item(j);
				xmlstr += "<" + node.tagName + ">";
				if (node.text != undefined) {
					xmlstr += node.text;
				} else {
					xmlstr += node.textContent;
				}
				xmlstr += "</" + node.tagName + ">";
			}
			xmlstr += "</row>";
		}
		xmlstr += "</rows>";
		return xmlstr;
	}

	function getErrorInfo() {
		return errorInfo;
	}

	function destroy() {
		delete(xmlDoc);
	}
}