FF/IE position:absolute bug
===

It seems Chrome is the only browser rendering my code the way I want.

If you notice my `position:absolute` is changing as the border size increases (in FF and IE) however is unaffected in chrome (which is exactly what I want).

[Here is a demo](http://jsfiddle.net/AyCKU/) Please try it in chrome/ie/ff to see the difference

The primary purpose of all of this black magic is simple, I need the `.thumb:after` to always be in the center of `.thumb` . If you know a better way let me know.