99% cpu usage on IE

(1 -> sorry form my english)

I successfully installed drupal 5.1 a few days ago, everything works perfectly but...
I have a problem in IE under WinXP(maybe 98?), sometimes, on some pages IE freezes and have 99% cpu usage!!
On FF and Opera everything is OK.

http://pizzeria-reddsred.pl

Arc Materia Theme

additional modules:
-Google Analytics
-Google Sitemap
-Paging
-Slideshow Creator
-GMap

Can anyone help me? Thanks...