function getUsers()
{
if (document.getElementById("usersCB").checked)
document.getElementById("usersDDL").style.display = "";
else document.getElementById("usersDDL").style.display = "none";

if(document.getElementById("usersDDL").innerHTML == "" && document.getElementById("usersCB").checked)
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
} 
var url="getUsers.php"
xmlHttp.onreadystatechange=stateChangedUsers
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
} 
 

function stateChangedUsers() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{// alert("done : " + xmlHttp.responseText);
document.getElementById("usersDDL").innerHTML=xmlHttp.responseText
} 
if (xmlHttp.readyState==1)
{ 
document.getElementById("usersDDL").innerHTML="<center><img src='Art/loading.gif' alt=''></center>";
} 
}