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function checkUserNameResult()
{
  if(xmlHttp.readyState==4)
  {
  if(xmlHttp.status==200)
  {
  if(xmlHttp.responseText=="true")
  {
  document.getElementById("imgflag").src="false.GIF";
  }
  else 
  {
  document.getElementById("imgflag").src="true.GIF";
  }
  }  
  }
}
function check_user(id) {
  if (id == "")
  return;
  document.getElementById("userid_msg").innerHTML = "<img src='images/loading.gif' align='absMiddle'> ¼ì²éÖУ¬ÇëÉÔºò¡­¡­";
  var url = "../RegistValidate.ashx?username=" + escape(id);
  xmlHttp.open("GET", url, true);
  xmlHttp.onreadystatechange = ShowResult;
  xmlHttp.send(null);
  }
  function ShowResult() {
  if (xmlHttp.readyState == 4) {
  if (xmlHttp.status == 200) {
  var s;
  s


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  var xmlhttp;
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