Untitled

LOGIN.PHP

<?php
$user = $_GET['user'];
$pass = $_GET['pass'];
 include("bd.php");
if($valida[$user]==$pass){
setcookie("logado", "1");
 echo "<script>location.href='main.php?usuario='$user</script>";
 }
 else{
 echo "<font face=verdana size=2>";
 echo "Usuário ou senha incorretos!";
 echo "<br>";
 echo "<a href=login.html>";
 echo "Clique aqui</a> para tentar novamente.";
 echo "</a></font>";
 }
?>

MAIN.PHP

<?php
if(IsSet($_COOKIE["logado"])){}
else{
echo '<meta http-equiv="refresh" content="0;url=login.html">';
exit;

}
?>
<html>
<head>
<title>Sistema de usuários</title>
</head>
<body>
<font face="Verdana" size="2">
<br><br> <a href="logout.php">Sair (finalizar) (logout)</a>
</font>
</body>
</html>