IE 7 + Adsence = Destruction!! Help Plz

Alright, is this some sort of bug with IE7? Firefox works fine with adsence, but IE7 destroys the site.

my site is www.templatesforfree.net.

here is the site in ie7 without adsence:
http://www.templatesforfree.net/images/ie7_no_adsence.gif

here is the site in ie7 once i put one ad from google adsence
http://www.templatesforfree.net/images/ie7_with_googleas.gif

Weerd, Now it work in ie7, and i didnt change anything... Anyone know why this happens? I don't want it to randomly happen again.