IE displaying differently width than Firefox

[Alfa]

server
Apache/1.3.37 (Unix) Sun-ONE-ASP/4.0.2 PHP/4.4.7 mod_throttle/3.1.2 FrontPage/5.0.2.2635 mod_psoft_traffic/0.2 mod_ssl/2.8.28 OpenSSL/0.9.6b

what can I do when its a completely new installation
no changes.

the width on the page is smaller in IE 7.0 then fire fox 3.0.6

http://www.shop.se/zen/zengrund7

Alfa

[tony_sar]

looks the same in both IE7 and firefox 3 from where i am