var xmlHttp
function showUser3(category_id)
 { 
 xmlHttp=GetXmlHttpObject()
 if (xmlHttp==null)
  {
  alert ("Browser does not support HTTP Request")
  return
  } 

/*var dd=  document.getElementById('subcat_id') ;
dd.options.length=0;
dd.options[0] = new Option("Loading Designation...");*/

 var url="responsexml.php"
 url=url+"?category_id="+category_id
 //alert(url);
 //url=url+"&sid="+Math.random()
 xmlHttp.onreadystatechange=stateChanged3
 xmlHttp.open("GET",url,true)
 xmlHttp.send(null)
 }
 
function stateChanged3() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{

			response  = xmlHttp.responseXML.documentElement;
			var list = response.getElementsByTagName('rec');
			// target is the global variable.
			var dd=  document.getElementById('subcat_id') ;
			dd.options.length=0;
			dd.options[0] = new Option("--Select Designation---","");
			for (var i = 0; i < list.length; i++)
			{
				var item = list.item(i);
				//dd.options[i+1] = new Option(item.firstChild.data, item.firstChild.data);
				dd.options[i+1] = new Option(item.childNodes[0].firstChild.text, item.childNodes[0].getAttribute("id"));

				
			}

 }
} 


 

function GetXmlHttpObject()
 { 
 var objXMLHttp=null
 if (window.XMLHttpRequest)
  {
  objXMLHttp=new XMLHttpRequest()
  }
 else if (window.ActiveXObject)
  {
  objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
  }
 return objXMLHttp
 }