There just seems to be a big problem with konqueror on javascript. Mainly I usually see the problems with javascript menus. This probably an issue in kjs for the KDE team to look at. I have two sites that I know have problems. They are www.bmwusa.com and www.sark.com. The bmw one has two lines at the top and it should only have one. The sark page the menu just don't expand like they should.
I'm sorry there's not much we can do. You might wait to see whether the khtml in kde-3.1.3 will fix it (should be out soon), else try to report it with kde itself.
Yep, if it's still a problem in newer kde versions please report it to the kde developers.