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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