var ajax_xmlHttp;
var txtMsg;
var valueCheck;
var isExistingUserID = 0;


function ajax_CheckExistingUser(inputControl, inTxtMsg, filePath)
{
	document.getElementById(inTxtMsg).innerHTML = "";
	txtMsg = inTxtMsg;
	var userid = document.getElementById(inputControl).value;
	valueCheck = userid;
	if (userid.length==0)
	{ 
		document.getElementById(txtMsg).innerHTML='<font color="red">Missing Field</font>';
		return;
	}
	
	ajax_xmlHttp= GetXmlHttpObject();
	
	if (ajax_xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	}
		 
	var url= filePath + "ajax/checkexistinguser.php";
	url=url+"?userid="+userid;
	url=url+"&sid="+Math.random();
	ajax_xmlHttp.onreadystatechange=ajax_stateChanged;
	ajax_xmlHttp.open("GET",url,true);
	ajax_xmlHttp.send(null);
} 

function ajax_stateChanged() 
{ 
	if (ajax_xmlHttp.readyState==4)
	{ 		
		if (ajax_xmlHttp.responseText == 'true')
		{
			isExistingUserID = 1;
			UserIdTaken = 1;
			var d = new Date();
			//document.getElementById(txtMsg).innerHTML = '<font color="red">Value [' + valueCheck + '] was already taken. Please choose another!</font>';
			document.getElementById(txtMsg).innerHTML = '<font color="red">Username already taken.</font>';
		}
		else
		{
			isExistingUserID = 0;
		}
	}
}

function GetXmlHttpObject()
{
	ajax_xmlHttp=null;
	try
	{
		// Firefox, Opera 8.0+, Safari
		ajax_xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
		try
		{
			ajax_xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			ajax_xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return ajax_xmlHttp;
}