Thanks for letting us know. Unfortunately only Michael can block ads and he's not around for a few more days, but I'm sure he will look into it once he's back.
The ads are generated by google based on the page content, so it's hard (well, impossible) to block out everything offensive before it shows up, but we do have the option to block a limited number of URLs once we know them. So would you happen to have the URL for the ad as well? I'll make sure Michael gets the details.
I no longer post here after VB was sold in 2012. (See my profile page for details.)