<?php
ob_start();
session_start();
if($_SESSION['logged_user'] != ""){
    header('Location: index.html');
}
$dbconnect = mysql_connect("localhost", "root", "");
mysql_select_db("mysite_bd");
$result = mysql_query("SELECT nick, password FROM users");
$list_f = mysql_query("SELECT * FROM users");
$n = mysql_num_rows($list_f);
$nickname = $_POST["nick"];
$password = $_POST["pass"];
for ($i = 0; $i < $n; $i++ ){
    if ($nickname == mysql_result($result, $i, nick) and $password == mysql_result($result, $i, password)){
            if ($_SESSION['logged_user'] == ""){
                $_SESSION['logged_user'] = mysql_result($result, $i, nick);
                $_SESSION['password_user'] = mysql_result($result, $i, password);
    }
}
}
mysql_close($dbconnect);
header('Location: index.html');
ob_end_flush();
?>