///////////////////////USERNAME CHECKING///////////////////////////////////

var xmlHttp;


function showHint(str)
{


if (str.length > 0)
{ 
var url="gethint.php?q=" + str
xmlHttp=GetXmlHttpObject(stateChanged)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 
else
{ 
//document.getElementById("txtHint").innerHTML=""
document.getElementById("txtHint").style.visibility='hidden';
} 
} 

function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		if(xmlHttp.responseText!='')
		{
			document.getElementById("txtHint").style.visibility='';
			document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
			//document.getElementById("user_name").value="";
			document.frm.user_name.select();
		}
		else
		{
			document.getElementById("txtHint").style.visibility="hidden";
		}
	//document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
	
	//document.getElementById("user_name").value="";
	
	} 
} 

function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("This example doesn't work in Opera") 
return 
}
if (navigator.userAgent.indexOf("MSIE")>=0)
{ 
var strName="Msxml2.XMLHTTP"
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP"
} 
try
{ 
objXmlHttp=new ActiveXObject(strName)
objXmlHttp.onreadystatechange=handler 
return objXmlHttp
} 
catch(e)
{ 
alert("Error. Scripting for ActiveX might be disabled") 
return 
} 
} 
if (navigator.userAgent.indexOf("Mozilla")>=0)
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler 
return objXmlHttp
}
} 


//////////////////////////////////////////////////////////////////////////