Sticky Content

Hi!

I’ve made the left sidebar sticky on this site:

http://testsiten.cwsurf.de/sticky.html

using this script:

http://www.dynamicdrive.com/dynamicindex11/stickycontent.htm

It works, but when I make the Browserwindow smaller, the left sidebar overlaps the content.

This doesn’t occur when I leave the Sticky Content Script out:

http://testsiten.cwsurf.de/

Does anyone know what causes this?