function XmlHttp() {
var xml = false;
		if(window.XMLHttpRequest) { 
			xml = new XMLHttpRequest();
		}
		else if (window.ActiveXObject) {
			try {
				xml = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					xml = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
			}
		}
		return xml;
	}
	
	
	
	
	
var xmlHttp;
var div; 
var reurl;

function show(url,divid) //往页面推层
{ 
xmlHttp=GetXmlHttpObject(); 
if(xmlHttp==null) 
{ 
alert("Browser does not support HTTP Request"); 
return ; 
}
div=divid;
xmlHttp.open("GET",url,true); 
xmlHttp.onreadystatechange=state; 
xmlHttp.send(null);  
}

function state() //判断是否加载完毕
{ 
if(xmlHttp.readyState==4&&xmlHttp.status==200) 
{ 
document.getElementById(div).innerHTML=xmlHttp.responseText; 
}else
{
//document.getElementById(div).innerHTML="<img src='img/Onload.gif'/>";
} 
}


function GetXmlHttpObject()  
{ 
var objXMLHttp=null;
if(window.XMLHttpRequest) 
{ 
objXMLHttp=new XMLHttpRequest(); 
} 
else if(window.ActiveXObject) 
{ 
objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP"); 
} 
return objXMLHttp; 
} 


var xml = XmlHttp(); 
function GetData(id){ 
var um=document.getElementById(id);
switch (id)
	{
	case "zixun":
	   xml.open("GET","inc/ajax.aspx?abc=zixun",true);
       break;        
	case "news":
	   xml.open("GET","inc/ajax.aspx?abc=new",true);
       break;        
    }
xml.onreadystatechange = function(){
if (xml.readyState == 4 && xml.status == 200){
var str = unescape(xml.responseText); //解码 
um.innerHTML=str;
}}
xml.send(null); }