var xhr;
var READY_STATE_UNINITIALIZED=0;
var READY_STATE_LOADING=1;
var READY_STATE_LOADED=2;
var READY_STATE_INTERACTIVE=3;
var READY_STATE_COMPLETE=4;

function AjaxRead(Url,ReadMethod) {
		//alert(Url);
		
		if(xhr==null)
		{
			SetAjaxobj();
		}
		var content;
		content="";
		xhr.open("GET",Url);		
		xhr.onreadystatechange=function() 
		{
			if(xhr.readyState!=READY_STATE_COMPLETE) 
			{
				/* 页面未完全加载 */
			} 
			else 
			{
				/* 页面已完全加载 */
				/* 标识全局WNGUID，限置AJAX缓存 */
				//alert(url+"\n"+url.lastIndexOf("&WNGUID="));
				content = xhr.responseText;				
				ReadMethod(content);				
			}
		}
		xhr.send(null);
   }
 function SetAjaxobj()
 {
		try 
		{
			xhr=new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch(e) {
			try {
				xhr=new ActiveXObject("Microsoft.XMLHTTP");
			} catch(E) {
			xhr=false;
			}
		}
		if(!xhr&&typeof XMLHttpRequest!='undefined') {
			xhr=new XMLHttpRequest();
		}
 }