var xmlHttp;

function chkUser(email) { 
	var url="ajax_user_check.php?email="+email;
	url=url+"&sid="+Math.random()
	//alert(url);
	xmlHttp=GetXmlHttpObject()
	xmlHttp.open("GET",url,false)
	xmlHttp.send(null)
	return xmlHttp.responseText;
}
	
	
/*
function stateChanged_user()  { 

	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") { 

		//var res=xmlHttp.responseText;
		//userExists=res;
	//alert(res);
		return xmlHttp.responseText;
	
	} 
	
}
*/

/*
function GetXmlHttpObject(handler)
{
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("Opera not supported...")
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 GetXmlHttpObject() {
	var xmlHttp_sub=null;
	try {
	 // Firefox, Opera 8.0+, Safari
		xmlHttp_sub=new XMLHttpRequest();
	}
	catch (e){
	 //Internet Explorer
		try  {
			xmlHttp_sub=new ActiveXObject("Msxml2.xmlHttp_sub");
		}
		catch (e) {
			xmlHttp_sub=new ActiveXObject("Microsoft.xmlHttp_sub");
		}
	}
	return xmlHttp_sub;
}