Heya Kbeeveer,
Wasn't sure if the version in that thread was the most recent version. So I downloaded the whole Pligg and used the version in the release software.
I redid the files and re-uploaded them. And it fixed all the errors in
Firefox except one. When you mouseover the title, a small graphic obscurs some of the text aproximately 170 pixels in from the begining of the title. Here's the image.
http://img277.imageshack.us/img277/652/error1kd6.gif
As for IE6, the only remaining bug is the background image I belive. I've tried every version of the background-repeat; and no-repeat command to stop it, to no avail with IE6.