Login script not working on x10 but works on home server

[Chris S]

I have this login script here:
http://ituneslibrary.x10hosting.com/highlight.php

and yes there is a database file included just its edited out for reasons. I am wondering if anybody can spot what is wrong because it will not load anything but a blank page. no errors or anything. so if anybody sees anything wrong can they please tell me.

[Xenon Design]

echo "Error, your account cannot be found.";
//Redirect wont work...echo writes headers
header("Location: ../../login.php?problem=notfound"); 

You cannot redirect after headers have been written! So that part is borked. The rest looks ok to me. The Session vars are a bit hacky to me. Maybe look into a uniqid generated function...but thats just me :P

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EDIT:
I just read up on ob functions. So then the above is ok BUT with x10 running Apache/1.3.37 (Unix) PHP/5.2.0 mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2635.SR1.2 mod_ssl/2.8.28 OpenSSL/0.9.7a

It may not have ob working or whatever. Ill keep looking through your code.
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Also do an ereg replace on the username POST field. Its like a hack waiting to happen!

$username2 = ereg_replace('[^A-Za-z0-9]', '', $_POST['username']);
//This will replace every thing (including whitespace...u can make it not to) thats not A-Z or a-z or 0-9 

Hopefully that will fix the problem

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EDIT:
FOUND THE PROBLEM (I hope)!! The mysql_num_rows returns as an integer and NOT a string. So change:

if (($num) == '0'){ 

To:

if ($num < 1){ 

And see if that works
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