var xmlHttp

function getModelSeries(str)
 {

 xmlHttp=GetXmlHttpObject();
 if (xmlHttp==null)
  {
  alert ("Browser does not support HTTP Request")
  return
  } 
 var url="components/com_enquiry/responsexml.php"
 url=url+"?q="+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")
{
 xmlDoc=xmlHttp.responseXML;
 //document.getElementById("firstname").innerHTML=
// xmlDoc.getElementsByTagName("firstname")[0].childNodes[0].nodeValue;
 document.getElementById("series_ajx_id").innerHTML=xmlHttp.responseText;
 }
} 

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