function $(id) {     return document.getElementById(id);     } function echo(obj,html) {     $(obj).innerHTML=html; } function fopen(obj) {     $(obj).style.display=""; } function fclose(obj) {     $(obj).style.display="none"; } function createxmlhttp() {     var xmlhttp=false;     try    {           xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");      }      catch (e) {           try {                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");           }          catch (e) {                xmlhttp = false;          }      }     if (!xmlhttp && typeof XMLHttpRequest!='undefined') {           xmlhttp = new XMLHttpRequest();                 if (xmlhttp.overrideMimeType) {//设置MiME类别             xmlhttp.overrideMimeType('text/xml');         }     }         return xmlhttp;     } function getdata(url,obj1,obj2) {         var xmlhttp=createxmlhttp();         if(!xmlhttp)         {             alert("你的浏览器不支持XMLHTTP！！");             return;         }         xmlhttp.onreadystatechange=requestdata;         xmlhttp.open("GET",url,true);         xmlhttp.send(null);         function requestdata()         {                 fopen(obj1);                 echo(obj1,"正在加载数据，请稍等......");                 if(xmlhttp.readyState==4)                 {                     if(xmlhttp.status==200)                     {                         if(obj1!=obj2){fclose(obj1);};                         echo(obj2,xmlhttp.responseText);                     }                 }         } }