JS 倒计时程序 在ASP.net 中无效

JS
<script type="text/javascript"> 

  var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP") ; 
  xmlhttp.open("GET", "http://www.shousin.cn", false) ;
  xmlhttp.setRequestHeader("Range", "bytes=-1") ;
  xmlhttp.send() ;
  var server_time = new Date(xmlhttp.getResponseHeader("Date")) ;
  server_time = server_time.getTime();
  
  server_time = new Date();
  server_time = server_time.getTime();
  
  var end_time = new Date("MAY 8,2010");
  end_time = end_time.getTime();
  
  var local_time = new Date();
  var server_local_time = server_time - local_time.getTime();

function GetRTime(){
var NowTime = new Date();
var nMS =end_time - NowTime.getTime()+server_local_time;
var nD =Math.floor(nMS/(1000 * 60 * 60 * 24));
var nH=Math.floor(nMS/(1000*60*60)) % 24;
var nM=Math.floor(nMS/(1000*60)) % 60;
var nS=Math.floor(nMS/1000) % 60;
 document.getElementById("RemainD").innerHTML=nD;
 document.getElementById("RemainH").innerHTML=nH;
 document.getElementById("RemainM").innerHTML=nM;
 document.getElementById("RemainS").innerHTML=nS;

setTimeout(&qu