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  var xmlHttp;
      function createXMLHttpRequest(){
        if(window.ActiveXObject)
        xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
        else if(window.XMLHttpRequest)
        xmlHttp = new XMLHttpRequest();
      }
      function check(){
     
     
        var responseDiv = document.getElementById("checktext");
     
        var username=document.getElementById('username');
     
        createXMLHttpRequest();
       
        url = "checkyh.do?department_id="+department_id+"&username="+username.value;
     
       
        xmlHttp.open("GET",url,true);
     
        xmlHttp.onreadystatechange = function(){
   
        if(xmlHttp.readyState == 4 && xmlHttp.status ==200 )
       
        var txt = xmlHttp.responseText;
       


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