can someone help me please

[bogdaniel]

hello i'm trying to do a user system but i don't have a very good ideea what should i do from where should i start. i've started with the login form and the code for it . but on the way i've got some problems the code doesn't work can you help me please ?

<?php
if($logged_in == 1) {
   echo 'lol';
} else {
?>
<div id="login">
<div class="content">
<form id="form1" method="POST" name="login" action="<? $_SERVER['PHP_SELF'] ?>">
<fieldset>
<legend>Sign-In</legend>
<label for="inputtext1">Client ID:</label>
<input  type="text" id= "username" name="username"/>
<label for="inputtext2">Password:</label>
<input  type="password" id="password" name="password" />
<input  type="submit" name="login" value="Log In" />

</fieldset>
</form>
</div>
</div>
<?php
if (!isset($_SESSION['username']) || !isset($_SESSION['id'])) {
        $logged_in = 0;
        return;
    } else {

        if (!get_magic_quotes_gpc()) {

        $username = mysql_real_escape_string(stripslashes($_POST['username']));
        $password = mysql_real_escape_string(stripslashes(md5($_POST['password'])));
        }
        $sql = mysql_query("SELECT username, password FROM members WHERE username ='" .
            $username . "'") or die(tmp_mysql_error());
        if (mysql_numrows($sql) == 1) {
            $set = mysql_fetch_array($sql);
            if ($password == $set['password']) {
                $_SESSION['username'] = $set['username'];
                $_SESSION['id'] = $set['id'];
                $_SESSION['usrlvl'] = $set['usrlvl'];
            }
        }
    }

}
?>

[Nile]

<form id="form1" method="POST" name="login" action="<? $_SERVER['PHP_SELF'] ?>">

Replace that with this:

<form id="form1" method="POST" name="login" action="">