function login($user,$pass) {
		if(isset( $_POST["login"] )) {

			if($user == strtolower(trim($_REQUEST["username"])) && $pass == sha1($_REQUEST["password"])) {
			$_SESSION["user_online"] = true;
			$_SESSION["username"] = $_REQUEST["username"];
			}
			elseif(mysql_num_rows($result) < 1) {
				echo "Fehlerhafte Login Daten!";
				echo '<meta http-equiv="refresh" content="1; url=index.php">';
			}

	}
}