User's Acess

i'm trying to creat 2 kind of acess from registered users

the administrators and the normal members

what I thought that I could use is the folowing:

<?php
// Recebemos os dados digitados pelo utilizador
$util = $_POST['utilizador'];
$pass = $_POST['password']; 
$acess = $_POST['acesso'];


$conn = mysql_connect("localhost", "root", "") or die("Impossivel conectar");

if($conn)
	{
		mysql_select_db("eventos", $conn);	
		} 

		$sql = "SELECT * FROM utilizador WHERE login = '$util' AND senha = '$pass' and acesso = $acess";		
	
		$rs = mysql_query($sql, $conn);		

		$num = mysql_num_rows($rs);

		if($num > 0)
			{

			$rst = mysql_fetch_array($rs);
				$id 	= $rst["id"];
				//$nome 	= $rst["nome"];
				$login 	= $rst["login"];
				$acess = $rst["acesso"];
				//Inicia a sessão
				session_start();


				$_SESSION["utilizador"]	= $login;

				mysql_close($conn);

				echo "<meta http-equiv='refresh' content='0;URL=index.php'>";
			}
else
		{

			mysql_close($conn);

			echo "<table width='100%' border='1' cellpadding='3' cellspacing='1' bgcolor='#FFFFFF'>";
			echo "</table>";
			echo "<b>Nenhum utilizador foi encontrado com os dados introduzidos... Por favor, tente novamente. Obrigado</b>";
			echo "<meta URL=acessCheck.php?acesso=$acess\">";
			echo "<meta http-equiv='refresh' content='4;URL=index.php?>";
		}
?>

in this piece of code, along with the username and password saving, I also have the $acess varaible which keeps "1" or "2", and in the end it sends the value in the <meta> tag to "acessCheck.php"

1=members acess, 2=administrator acess

acessCheck.php:

<?php
$conn = mysql_connect("localhost", "root", "") or die("Impossivel conectar");

$id = $_SESSION['id']; // session member id
$acess = intval($_GET['acesso']);
$sql = mysql_query("SELECT * FROM utilizador WHERE acesso='$acess'");
$sqlM = mysql_fetch_assoc($sql);
$membro = $sqlM['acesso']; // Isto pega o nivel do membro

if($membro == 2)
{
            echo "<p align=left>Bem-vindo(a) ". $_SESSION['utilizador']."</p>";   //mostra informação da sessão
            echo "<p align=right><a href=admin.php>Administrar</a></p>";
            echo "<p align=right><a href=logout.php>Log Out</a></p>";            
}
else if ($membro == 1) {
            echo "<p align=left>Bem-vindo(a) ". $_SESSION['utilizador']."</p>";   //mostra informação da sessão
            echo "<p align=right><a href=logout.php>Log Out</a></p>";   
}
else {
            include("login.php");
            }
?>

and I include acessCheck.php into "index.php" in this piece of code below

...
            <?php         if (isset($_SESSION['utilizador']))
            {
            //echo "<li><a href='#'>Admin</a></li>";
            include ("acessCheck.php");  
            }
            
                echo "<br>";
                echo "<br>";
            ?>

...

althought this is returning me this error:

Notice: Undefined index: id in C:\xampp\htdocs\xampp\eventos\acessCheck.php on line 4

Notice: Undefined index: acesso in C:\xampp\htdocs\xampp\eventos\acessCheck.php on line 5

Warning: mysql_fetch_assoc() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\xampp\eventos\acessCheck.php on line 7

for what I know, if it is returning boolen, which in this case it is status "false".. i understand the select didn't select anything according to the conditions..

I've already checked if the parameter $acess sent was the same everywhere and it is.. my guess is that that <meta> is not doing so good

what do you think?