var xmlHttp=null;	
var user_status =0;
function GetMainXmlHttpObject(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;
	}
} 


function user_exist(frm)
{ 
    var u_uid = frm.u_uid.value;
    var url = "../inc/php/user_exist.inc.php?pid=" + Math.floor(Math.random()*5)+ "&u_uid=" + u_uid;
	xmlHttp=GetMainXmlHttpObject(stateChanged);
	xmlHttp.open("GET", url , true);
	xmlHttp.send(null);
	return false;
}

function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		//document.getElementById(obj_name).innerHTML=xmlHttp.responseText; 
		user_status = xmlHttp.responseText;
		
		//alert(user_status + " 1231" + xmlHttp.readyState + "  what is up");
		//alert(user_status);
	} 
	addMemSubmit(document.forms['initfrm']);
}