var xmlHttp;
var level;
function selOcc(l, str)
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request");
 return;
}
level=l;
var url="listpop.php";
url=url+"?l="+level+"&v="+str;
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function stateChanged()
{
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 {
  switch (level){
    case "1":
         document.getElementById("txtState").innerHTML=xmlHttp.responseText;
         document.getElementById("txtAreaType").innerHTML=" ";
         document.getElementById("txtArea").innerHTML=" ";
         document.getElementById("txtInd").innerHTML=" ";
         document.getElementById("txtOcc").innerHTML=" ";
         break;
    case "2":
         document.getElementById("txtAreaType").innerHTML=xmlHttp.responseText;
         document.getElementById("txtArea").innerHTML=" ";
         document.getElementById("txtInd").innerHTML=" ";
         document.getElementById("txtOcc").innerHTML=" ";
         break;
    case "3":
         document.getElementById("txtArea").innerHTML=xmlHttp.responseText;
         document.getElementById("txtInd").innerHTML=" ";
         document.getElementById("txtOcc").innerHTML=" ";
         break;
    case "4":
         document.getElementById("txtInd").innerHTML=xmlHttp.responseText;
         document.getElementById("txtOcc").innerHTML=" ";
         break;
    case "5":
         document.getElementById("txtOcc").innerHTML=xmlHttp.responseText;
         break;
    default:
         alert ("Invalid AJAX request");
  }
 }
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}