Rails spinoffs - Feb 2007 - [Slightly OT] Firefox showing scrollbars "through" a floating DIV

I have a hidden DIV floating (z-index: 100) above my page where I 
display my slide-sorter image picking interface. I show this DIV with 
Element.show(), and populate its contents with Ajax.Updater. Everything 
shows up and looks fine in Safari, but Firefox 1.5.09/Mac shows the 
scrollbars from a div (overflow: auto) on the page below cutting right 
through the content of the floated DIV.

I''ve tried manually setting the z-index on the scrolling div to 1, but 
that had no effect.

I hacked around the problem by using Element.hide() to remove the 
offending element from view while the hidden layer is showing. But I 
would really like to understand what''s happening here so I can avoid it
from the start rather than just treating the symptom.

Has anyone seen this before, or do you have any guesses?

Thanks,

Walter


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