var xmlHttp ;
var $img_loading = "loading.gif";
var $msg = "<br>loading ...."; 
$img_loading = "<img src='"+$img_loading+"' /> ";

function showUser(str)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request");
 return ;
 }
var url="dat1.php" ;

if (str==16)
 {

var url="dat.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")
 { 
 document.getElementById("txt4").innerHTML=xmlHttp.responseText  ;
 } 
else { document.getElementById("txt4").innerHTML = $img_loading+$msg; }
}

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;
}