var xmlHttp;
function showUser(str,field)
 { 
 xmlHttp=GetXmlHttpObject();
 if (xmlHttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  } 

 var url="responsexml.php";
 url=url+"?q="+str;
  url=url+"&f="+field;
 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")
{


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