warning won't go away :(

[SyncViews]

Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0

login.php <this is the page i'm displaying that gives the error...

<?php
$page_name = 'Login';
$root_level= '';
include('include/config.php');//passwords etc
include('include/start.php');

if(!isset($_POST["stay"])) $_POST["stay"] = 0;
if(isset($_POST["name"]) && isset($_POST["pass"]))
{
	//shouldn't be here
	if($user_loggedin) header('location:' . $url_root);
	//login
	else
	{	
		$login = login($_POST["name"], $_POST["pass"], $_POST["stay"]);
		$smarty->assign("LOGIN_RESULT", $login);

		$smarty->display('header.tpl');
		$smarty->display('login.tpl');	
		$smarty->display('footer.tpl');
	}
}
//no data...
else header('location:' . $url_root);
?>

start.php

<?php
session_start();
//get functions
include ($root_level . 'include/functions.php');

//connect
$con = mysql_connect($sql_host, $sql_user, $sql_pass) or exit('Failed to connect to database: ' . mysql_error());
mysql_select_db($sql_db, $con);

$style = $def_style;
//only if it's set and true...
if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"])
{
	$user_loggedin = true;
	$user_name = $_SESSION["user_name"];
	$user_id   = $_SESSION["user_id"];
	$user_last = $_SESSION["user_last"];
	$user_pms  = 0;
}
else
{
	$user_loggedin = false;
	$user_name = "Visitor";
	$user_id   = 0;
	$user_last = 0;
	$user_pms  = 0;
}
...template stuff doesn't touch sessions...
?>

functions.php

<?php
//returns non-zero on fail
function login($name, $pass, $stay)
{
global $smarty, $user_loggedin, $user_name, $user_id, $user_pms, $user_last, $domain;

if(!valid($name, "name")) return 1;
if(!valid($pass, "password")) return 2;

//check user exists + correct password
$query = mysql_query('SELECT user_id, password, salt, banned, last FROM users WHERE username="'.$name.'"') or exit(mysql_error);
if(mysql_num_rows($query) != 1)return 3;
$data = mysql_fetch_array($query);
if($data["banned"]) return 5;
if(md5($data[salt] . $pass) != $data["password"])return 4;

//set varibles
$user_loggedin = true;
$user_name = $name;
$user_id   = $data["user_id"];
$user_pms  = 0;
$user_last = $data["last"];

$_SESSION["loggedin"]  = 1;
$_SESSION["user_name"] = $data["username"];
$_SESSION["user_id"]   = $data["user_id"];
$_SESSION["user_last"] = $data["last"];

//assign smarty varibles
$smarty->assign('USER_LOGGEDIN', $user_loggedin);
$smarty->assign('USER_NAME',     $user_name);
$smarty->assign('USER_ID',       $user_id);
$smarty->assign('USER_LAST',     date("H:i:s d-m-y",$data["last"]));
$smarty->assign('USER_PMS',      $user_pms);

//stay logged in
if($stay)
{
	$cookie['username'] = $name;
	$cookie['password'] = $pass;
	setcookie('login', serialize($cookie), time()+days(60), '/','.' . $domain);
}
//update last login time
mysql_query('UPDATE users SET last='.time().' WHERE user_id='.$user_id);
return 0;
}
?>

[Gamic]

Do the inputs on the form you use to login have the name attribute set? (I was getting this the other day with only the id attribute set)

[SyncViews]

All have there names set...

	<form action="{$URL_ROOT}login.php" method="post">
	<label for="login_name">Username:</label><input type="text" name="name" id="login_name" />
	<label for="login_pass">Password:</label><input type="password" name="pass" id="login_pass" />
	<label for="login_stay">Stay logged in:</label>	<input type="checkbox" name="stay" id="login_stay" />
	<input type="submit" value="Login" />
	</form>