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<script type="text/javascript">
    var myXml;
    function createHttpXML(){
    if(window.ActiveXObject)
        myXml=new ActiveXObject("microsoft.XMLHTTP");
    else if(window.XMLHttpRequest)
        myXml=new XMLHttpRequest();
        }
       
    function updatePage(){
    if(myXml.readyState==4)
        if(myXml.status==200)
        {
          var response=myXml.responseText;
          test1.innerHTML=response;
          }
    }
   
    function getHttpXml(){
    createHttpXML();
    var username=document.getElementById("TextBox1").value;
    if((username==null)||(username==""))
        return;
    var url="Validate.aspx?UserName="+escape(username);
    myXml.open("GET",url,true);
    myXml.onreadystatechange=updatePage;
    myXml.send(null);
    }   

    </script>

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