Yes, vid caps are images captured from a video, often not very good quality, but sometimes they can be pretty good.
This is the code I use for my mouseovers to hide sponsor code. Add it to your <a> tags and replace the xxxxx with
http://www.sponsorsite.com/
HTML Code:
onmouseover="window.status='XXXXXXXXXX';return true" onfocus="window.status='XXXXXXXXXX';return true;" onmouseout="self.status='';return true"