dynamic height with display:none

[Paul Lindner]

Hi,
I have a situation where I'd like to calculate render a gadget but not
display it immediately. I set the css class display:none on a div
surrounding the iframe.  To display the gadget I remove that style.  So far
so good.  However I've noticed that in Firefox (and perhaps other places
too) that dynamic-height will always return height 0 in this case.  As a
workaround I've moved the divs offscreen with absolute positioning, but that
seems somewhat ugly.