Okay, it's been taken care off for real now. The exploit was based on using the index2.php file at the zelaron.com portal to "load" a php script into the page from an outside site. I've disabled the ability to load other sites into it, so this could (hopefully) not happen again.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram