@ jancarlo : you are trying the chatbox in an extremely stressing
environement

... mac os and IE 5.x.... pfiouuu, i've never even
thought about trying it on such a platform

... Also, it looks like
you are using it in a kind of popup since i donn't see any iframe
and forum around the chatbox ...
To have a serious look at your problem maybe you could give
me the html code of the frameset and the two frames... just
to see what IE5mac could misinterpret.
@superman : yup i just tried it also, and works fine for me too

.