Problems using login.php

Hi guys,

I'm trying to use WinHTTrack to produce an offline copy of a password protected album on my gallery (version v1.4.4-pl4). I followed the explanations on:
http://gallery.menalto.com/wiki/Creating_an_Offline_Copy regarding using login.php to set username and password.
But when I try to download the album all unprotected albums are downloaded and not the protected one.

I tried to use the login.php separately, to see if HTTrack can do perform the login (username and password changed):
http://cyon23.homeip.net/gallery/login.php?uname=test&gallerypassword=12345&set_offline=false

But I do end up with a page showing "Error: Invalid username or password" and input fields for the credentials. I can enter the ones provided in the URL and I'm able to log on. So the username/password combination is valid.

Could someone help me? Any help greatly appreciated!

Thank you,

Kurt