Navigator message box keeps popping up about "main.php"

Hello,

I run Gallery2 just fine, I am not a good developer, but I managed to make it work on a free hosting website (www.free.fr), which wasn't easy, and required a few changes in the code and stuff...

Anyway, it works now. Problem is, many times when I click on a link, I get a Firefox message box popping up asking if I wether want to open "main.php" with Dreamweaver (read : current web editor) or any other software, or if I'd rather download it on disk.

If I click "cancel" on that message box, nothing happens, and I have to click again on the link to get to my target page.

I would say this happens like 3 times out of 4 attemps.

It happens for instance when :
- I just click on the "Gallery" link (I mean the one leading to the main page)
- I uploaded pics, after the download has been done, when it's about to go to the next page, the message box just appears...

Any idea where is the problem ?

My website, in case you can check it out by yourself (nobody has told me about this problem, so I don't know if it's just me as an admin... I don't have many people going there yet, too...) : http://livepics.free.fr/gallery2/

Thank you for your help.

Gallery version = 2.2.3 noyau 1.2.0.5
PHP version = 5.1.3RC4-dev cgi-fcgi
Serveur Web = Apache/ProXad [Jan 10 2008 05:02:09]
Base de données = mysqlt 5.0.45, lock.system=database
Boîtes à outils = Exif, Gd, SquareThumb, LinkItemToolkit
Accélération = partial/900, partial/900
Système d'exploitation = Linux dyn44-g5.priv.free.fr
Thème par défaut = carbon2
gettext = activé
Langage = fr_FR
Navigateur Web = Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
Lignes dans la table GalleryAccessMap = 164
Lignes dans la table GalleryAccessSubscriberMap = 664
Lignes dans la table GalleryUser = 2
Lignes dans la table GalleryItem = 664
Lignes dans la table GalleryAlbumItem = 51
Lignes dans la table GalleryCacheMap = 4