function Login(){
	
	CheckCompatibility();
	
	url = "functions.php?WTD=Login";
	url = url +"&Usr="+document.getElementById('Usr').value;
	url = url +"&Pwd="+document.getElementById('Pwd').value;
	//alert (url);
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
	xmlHttp.onreadystatechange=function (){
								if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
									{		//alert(xmlHttp.responseText);
										if (xmlHttp.responseText==0){
											alert('Wrong Credentials!');
										}else{
											LoadUser(xmlHttp.responseText);
										}
									}
								}
}



function CheckCompatibility()
{
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
		alert ("Browser does not support HTTP Request");
		return;
	}
}

function GetXmlHttpObject()
{
	var objXMLHttp=null;
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	return objXMLHttp;
}