Just be on the safe side, I had one of our developers scan the site code to see if anything got injected into it. He didn't find anything and believes this is an issue with Internet Explorer 9. If you're experiencing the issue, try using another browser and seeing if the issue clears up. If not, let us know the ad that's on the page (name of advertiser and link the ad goes to), as well as the source of the
JS file, and we'll take a look.
EDIT TO ADD:
For what it's worth, Google Safe Browsing diagnostic shows both above reported
JS sources to be safe:
Google Safe Browsing diagnostic page for pixel.adsafeprotected.com
Google Safe Browsing diagnostic page for choices.truste.com