创建xml document对象

//创建xml document对象
	function loadXMLDoc(dname) 
	{
		var xmlDoc;
	// code for IE
		if (window.ActiveXObject) {
			 xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
		 }
	// code for Mozilla, Firefox, Opera, etc.
		else if (document.implementation && document.implementation.createDocument) {
			xmlDoc=document.implementation.createDocument("","",null);
		} else {
			  alert('Your browser cannot handle this script');
		 }
		xmlDoc.async=false;
		xmlDoc.load(dname);
		return(xmlDoc);
	}