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Code:
<?php

        session_start();

        include("db.php"); include("functions.inc.php");

        if(exist("users WHERE name = '".umbruch($_REQUEST["name"])."' AND passwort = '".md5($_REQUEST["passwort"])."' AND status = '1'") && anzahl("users_login WHERE ip = '".getenv("REMOTE_ADDR")."' AND erfolgreich = '0' AND timestamp > '".(time()-60*30)."'") < 4) {

            $_SESSION["login"] = value("users WHERE name = '".umbruch($_REQUEST["name"])."' AND passwort = '".md5($_REQUEST["passwort"])."' AND status = '1'","id");

            if($_REQUEST["bleiben"] == "1") {

                setcookie("webvids_name",umbruch($_REQUEST["name"]),(time()+60*60*24*14));

                setcookie("webvids_passwort",md5($_REQUEST["passwort"]),(time()+60*60*24*14));

            }

            mysql_query("INSERT INTO users_login (name, ip, timestamp, erfolgreich) VALUES ('".umbruch($_REQUEST["name"])."', '".getenv("REMOTE_ADDR")."', '".time()."', '1')");

            header("Location: memberarea.php");

        } else {

            mysql_query("INSERT INTO users_login (name, ip, timestamp, erfolgreich) VALUES ('".umbruch($_REQUEST["name"])."', '".getenv("REMOTE_ADDR")."', '".time()."', '0')");

            if(anzahl("users_login WHERE ip = '".getenv("REMOTE_ADDR")."' AND erfolgreich = '0' AND timestamp > '".(time()-60*30)."'") >= 4) {

                header("Location: login_fehler.php?fehler=1");

            } else {

                header("Location: login_fehler.php?fehler=2");

            }

        }

    ?>