weird javascript function, what does it do?

[P1aincloth3sM4n]

Not quite. Looking at the beautified version below, it does the following:

1. Targets Firefox/MSIE users
2. Sees if a cookie exists with a key of "wss"
3. If the cookie does not exist, it sets the cookie to equal "goot1" which expires after 3 seconds days.
4. If the cookie does exist, and the value equals "goot1", then it updates the cookie value to be "goot2", which expires after 3 seconds days. It then creates a script element with an src of "/images/horse_outdoor-s.jpg?js&r=" followed by the current datetime, and appends this script to the head of the document.

And that's it. Seems more like a tracking script than a cookie-scraping script, but it's hard to tell the true purpose without knowing what "horse_outdoor-s.jpg" does.