function postMenu(id) {
	//var idNum = id.substr(1);
	document.forms[0].PageId.value = id;
	document.forms[0].submit();
}
function newElement(id){
	alert(id);
}
function showLogin(){
	document.getElementById('login').style.display = "inline";
}

function preLogin(){
	var errMsg = '';
	if(document.forms[0].Login.value == ''){
		errMsg = "Login required \r\n";
	}
	if(document.forms[0].UserPwrd.value ==''){
		errMsg = errMsg + "Password required";
	}
	if(errMsg.length > 0){
		alert(errMsg);
	}else{
		AJAXlogin(document.forms[0].Login.value,document.forms[0].UserPwrd.value);
	}
}

var xmlHttp

function AJAXlogin(id,pwd) { 
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null) {
		 alert ("Browser does not support HTTP Request")
		 return
	 }
	var url="includes/checkLogin.php"
	url=url+"?id="+id+"&pwd="+pwd;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=showError 
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function showError() { 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") { 
	 	document.getElementById("errorMessage").innerHTML=xmlHttp.responseText 
	 	if(xmlHttp.responseText==''){
		 	window.location.reload();
		}
	 } 
}
function GetXmlHttpObject() {
	var xmlHttp=null;
	try {
		 // Firefox, Opera 8.0+, Safari
		 xmlHttp=new XMLHttpRequest();
	} catch (e) {
		 //Internet Explorer
		 try  {
		 	 xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		 } catch (e)  {
		  	xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		 }
	 }
	return xmlHttp;
}