Hmmm,
Interesting fact.
Ok, I'm good at solving such problems!
Here what we should do!
1. Name ALL your TOOLBARs software installed in your browser, like GoogleToolbar or YahooToolbar and what Browser you use. Do you have antivirus installed? Any other software related to eBay installed?
2. Could you send me a link example which diverts to another web site like you said. I will simply try it from my PC and see what happens
After that, we'll seeeeee.......