thanks A LOT, phreax!

here's the stupid fact:
i just had two files with the same name: one was the actual game, and the other was the animated banner done in flash. i put both in the same folder, so when asking for deleting one of the files, i choose of course to delete the oldest... which was the game. arg!!!

too bad, i was ready to improve it a bit (adding a boss, a player selection screen, another area, just for fun). damn!

i used a prog to look for deleted files, but the game didn't appear... :-(