Hacked!!!

Ok, I got hacked 3 times last weekend, I've been working on getting things back up all week. Apparently it was over an email they recieved and when I tried going to my site I got these errors that led me to 2 pages which were now the same and they said something like: "Don't email people on your list unless it's critical" and there seemed to be "invisible code" underneath the original page code...that's what I was seeing in the control panel edit. They left and searched for at least 2 files : .../.../uwantthis.html and .../.../evil_dave.html