window.top refers to either the first declared frame if in a framset or the only window if not. There is no such thing as window.bottom. So if you always use the syntax:
Code:
window.top.<name of frame>.<name of function>();
you should be fine. I believe that is valid on all browsers, if not then an alternative is:
Code:
window.top.frames["<name of frame>"].<name of function>();
--
Joe (
Microsoft MVP - XML)