Hi Marina
What exactly is your problem with mollom?
One thing that got me confused for quite a while was the fact that any captchas are disabled as long as you are logged in into the CMS!
I always thought that Mollom did not work at all or only work in Firefox when i was implementing it, where the acutal problem was that I was still logged in into the Admin panel. After clicking Logout Mollom started showing.
Hope that helps and otherwise please be a bit more specific with your problem.
Best regards
Thomas