Boy, this feels like 'slow' MSN :)

Thanks for the answer, I have a catalog sidebox which I want replaced with a live chat box, so people don't have to scroll down and up etc.
An example (should be in JS i think, but PHP is fine as well), would be appreciated.

OH, and it is just for two sideboxes, not like a visitor gets to bump sideboxes all over the place :)