Someone apparently hacked into the site, somehow, and did a virus injection on three of the pages. I've removed the infected versions and put in my own copies of the files (stupid person hacked a site with gratuitous backups).
Now I'm virus scanning my machine to make sure I didn't get anything, then I'll go through and fix the passwords on the server and report the incident to my server hosts. Hopefully that will fix the issue in the future.
Sorry for any inconvenience this may have caused.