עזרה | התחברות עם Md5 - לא עובד!

[EBSites]

אני נתקל בבעיה, לא מתאפשר לי להתחבר למערכת עם MD5.
תודה לעוזרים.

PHP קוד:

<?php
                if(isset($_POST['tmp']) && $_POST['tmp']=='login'){
                    unset($_POST['tmp']);
                    $query    = "SELECT * FROM users";
                    $result    = mysql_query($query) or die('Query failed: '.mysql_error());
                    $check = 1;
                    while($row = mysql_fetch_array($result)){
                        if(!strcmp($_POST['user'],$row['username']) && !md5($_POST['pass'],$row['password'])){
                            $_SESSION['logged']=$_POST['user'];

                            $pass = md5($_POST['password']);

                            $_SESSION['nnwriter']=$row['namewriter'];
                            $_SESSION['nnid']=$row['id'];
                            echo "";
                            $check = 0;    
                            break;
                        }
                    }
                    if($check)
            ?>
<font style='font-size:17px;color:#FF0000;'>שם משתמש או סיסמא שגויים!</font>
<br /><br />
            <?php
                }else{
}
?>
            <form name="login" method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>">
                <input type="hidden" name="tmp" value="login" />
                <table width="350" cellpadding="0" cellspacing="0">
                    <tr>
                        <td><b>שם משתמש :</b></td>
                        <td><input class="panel" type="text" name="user" /></td>
                    </tr>
                    <tr>
                        <td><b>סיסמא :</b></td>
                        <td><input class="panel" type="password" name="pass" /></td>
                    </tr>
                    <tr>
                        <td><br></td>
                        <td colspan="2"><br><input class="submitpanel" type="submit" value='התחברות' /></td>
                    </tr>
                </table>
            </form>