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JavaScript Code

function ajax(login)
{
 	try {
		req = window.XMLHttpRequest?new XMLHttpRequest():
		new ActiveXObject("Microsoft.XMLHTTP");
	} catch (e) {
		//Kein AJAX Support
	}
 
	req.onreadystatechange = function() {
		if ((req.readyState == 4) && (req.status == 200)) { 
			var feedback = req.responseText;
			if(login == true && feedback.substr(0,11) == "<-ON->")
				document.location.href = "quelle/myprofile.php";
			else if(login == false)
				document.getElementById('mainContent').innerHTML = feedback;
			else
				document.getElementById('content').innerHTML = feedback;
 
		}
	}
	req.open('POST', 'secure.php');
	req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); 
 
	if(login == true)
		req.send('submit=1&user='+document.ajaxlogin.user.value+'&password='+document.ajaxlogin.password.value);
	else
		req.send(null);
}

PHP Quellcode

<?php
include 'sql/opendb.php';
$conn;
$file = "SELECT nick_name,password,user_id FROM t_customer WHERE nick_name ='{$_POST['user']}'";
$file_query = mysql_query($file);
 
while($daten = mysql_fetch_assoc($file_query))
{
if($daten['user_id'] != 0)
	{
    	$id = $daten['user_id'];
    	$nick = $daten['nick_name'];
    	$pass = $daten['password'];
	}
 
 
 
session_start();
if($_POST['submit'] == 1) {
	$_SESSION['user'] = $_POST['user'];
	$_SESSION['password'] = md5($_POST['password']);
    	$_SESSION['id'] = $id;
}
 
$user = $_SESSION['user'];
$login = false;
	$user = $nick;
	$password = $pass;
 
	if($user == $_SESSION['user'] && $password == $_SESSION['password']) {
		$login = true;	
	}	
}
 
 
 
if($login == false) {
	echo '<div style="position:absolute;left:20%;top:100px;width:300px;border:1px solid #000000">';
	if($_POST['submit'] == 1)
            	echo 'Fehler beim Login. Benutzername und/oder Passwort nicht korrekt.';
 
    	else
            	echo 'Bitte anmelden';
 
	require('login.php');
	echo '</div>';
	die();
}
include 'sql/closedb.php';
require('content.php');
 
?>