function checkusername()
{
  msg=new Array("<font color=#FF0000><img src=images/li_err.gif>请输入用户名!</font>")
  var obj=document.getElementById("checkusername");
  var str=document.getElementById("UserName").value;
  if (document.addNEWS.UserName.value=="")
  {
    obj.innerHTML=msg[0];
  } 
  else
  {
      document.getElementById("checkusername").innerHTML="<img src=images/loading.gif>Please Waiting...";
      var req = false;
      if(window.XMLHttpRequest)
      { 
        req = new XMLHttpRequest(); 
        if (req.overrideMimeType)
        {
          req.overrideMimeType("text/xml");
        } 
      }
      else if(window.ActiveXObject)
      { 
        var msxml = new Array('MSXML2.XMLHTTP.5.0','MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP','Microsoft.XMLHTTP'); 
        for(var i=0;i<msxml.length;i++)
        { 
	  try
          { 
           req = new ActiveXObject(msxml[i]); 
           break;
          }
          catch(e){} 
        }
      } 
      if (!req)
      {
        alert("Your browser does not support Ajax system, upgrade your browser"); 
        return false; 
      }  
      req.open("GET","Reg_UserCheck.asp?username="+escape(document.addNEWS.UserName.value), true);  
      req.onreadystatechange = function()
      {
　    if (req.readyState == 4) 
      { 
　      if (req.status == 200) 
        { 
　　      var s=req.responseText; //接收返回�?
        }
        if (s=="0")
        {
		  window.setTimeout("ajaxright()",2000);
        }
        if (s=="1")
        {
		  window.setTimeout("ajaxwrong()",2000);
        }
      }
    }
    req.send(null); 
  }
} 
function ajaxright()
{
  document.getElementById("checkusername").innerHTML="<img src=images/li_ok.gif>恭喜您，您可以使用此用户名注�?";
  document.addNEWS.iptCkName.value="";
}
function ajaxwrong()
{
  document.getElementById("checkusername").innerHTML="<img src=images/li_err.gif><font color=#FF0000>对不起，此用户名已经被人注册!</font>";
  document.addNEWS.iptCkName.value="failed"
}



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