Forum Moderators: open
As these things don't insert themselves, you or someone involved with putting the pages together must have included that line at some point.
If you are genuinely stymied by how this got there (and I assure you it was by a person with read/write access to the file, not some kind of script or worm) go to the URL indicated by the script (up to the .com part) and contact their customer service.
For your comfort, it will have absolutely no negative impact on your site if you remove the line. You might want to check with WebtraffIQ customer service first, though, just in case your boss signed up with them and didn't tell you. :)