kde virtual desktops...

[jpugh@cs.uoregon.edu (enantiomer)]

I am using kde right now and am wondering if anyone can answer this
question... when I switch between desktops 1-4, the stuff on the
screen gets switched over, but the actual applications are still shown
in the taskbar.  I would like it if when I switch from desktop1 to
desktop2, the apps in the taskbar that I opened in desktop1 dont show
in the taskbar anymore.  I use this feature in my unix account at
school in order to maintain order within my desktop (stop it from
getting cluttered, etc...)  Anybody know how to do this?  I looked in
the control center and didn't see anything.  thanks!
   Enantiomer