var xmlHttp;
		function  callAjax(url,id){
   			createXMLHttpRequest();
   			xmlHttp.onreadystatechange  =function handleStateChange(){
   				if(xmlHttp.readyState == 4) {
       		 if(xmlHttp.status == 200) {
        		 dispaly(id);
      		  }
   			 }else{
   			 	document.getElementById(id).innerHTML="正在加载数据...";
   			 }
   			}
  			xmlHttp.open("POST", url, true);
  			xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");
  			xmlHttp.send(null);
		}
		
		
  		function dispaly(id){
  			var div  = document.getElementById(id);
  			div.innerHTML =  xmlHttp.responseText;
  			
  		}

		function createXMLHttpRequest() {
  	  		if (window.ActiveXObject) {
       		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
   			 }
   		 	else if (window.XMLHttpRequest) {
        	xmlHttp = new XMLHttpRequest();
   			}
		}