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