Problems with mysql and sessions

[bubbles19518]

Fixed it.

[kreoton]

maybe there is problem in registration file, given code looks ok

[bubbles19518]

The user id is set to auto increment
Here is reg script

<?
if($action == "submit")
{
if(!empty($_POST['submit']))
{
$link = mysql_connect("localhost", "beng_beng","r0f101");
mysql_select_db("beng_note", $link);
if($_POST['pass'] != $_POST['pass2'])
{
$message = "Your passwords do not match, please retype them.";
exit();
}
$encpass = md5($_POST['pass']);
$sql = "SELECT * FROM users WHERE username='$_POST[user]'";
$result = mysql_query($sql, $link) or die(mysql_error());
if(mysql_num_rows($result) != 0)
{
$message = "This Username is already taken, please try a different one.";
exit();
}
$sql = "SELECT * FROM users WHERE email='$_POST[emailf]'";
$result = mysql_query($sql, $link) or die(mysql_error());
if(mysql_num_rows($result) != 0)
{
$message = "This Email is already taken, please try a different one.";
exit();
}
$query = "INSERT INTO `users` ( `id` , `username` , `password` , `email` , `name` , `school` , `major` , `cname` , `cnumber` , `cteacher` , `cdays` ) VALUES (NULL , '$_POST[user]', '$encpass', '$_POST[emailf]', '', '', '', '', '', '', '')";
if(mysql_query($query))
{
$message = "Account created successfully!";
}
mysql_close($link);    
}
}
?>