Cross-Browser-Support: Make Busy theme look the same in IE FF, Safari et al

Issue Summary

This is a collective issue to prevent issue creep from that. Just write down issues you find (and best fix them right away :) ). If some are particulary nasty, we can open seperate issues for them.

Already some cross-browser-support is in place. Removed quite some stuff that made the teasers have different distances in FF and IE. Mainly did this by using padding instead of margin on a lot of elements.