// JavaScript Document var url="getcustomer.asp?sid=" + Math.random() + "&q=" + str
var xmlHttp;	
function userLogin(uname,pword)
{
	xmlHttp=GetXmlHttpObject();
	var url="ajax_userlogincheck.php?user_name=" + uname + "&password=" + pword;
	if (xmlHttp==null)
	{
		alert ("Browser does not support HTTP Request")
		return
	}
	xmlHttp.onreadystatechange=loginCheck 
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
} 

function loginCheck() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 		
		if(xmlHttp.responseText == 1){
			alert('Invalid Username');
		}else if(xmlHttp.responseText == 2){
			alert('Invalid Password');
		}else if(xmlHttp.responseText == 3){
			alert('You are already logged in');
		}else{
			document.frmUserLogin.submit();
			window.location = './usermain.php';			
		}			
	} 
}
function GetXmlHttpObject()
{ 
	var objXMLHttp=null
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest()
	}
	else if (window.ActiveXObject)
	{
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
	}
	return objXMLHttp
}