Actually my reference doesn't list height as a valid property but I think that is an oversight. It does state though that dimensions for width skould be pixels or percentage.
Code:
<IFRAME SRC="" id='richedit' height="42px" width="100%">
I don't think you can set the font height for the iframes contents by using surrounding font tags. You need to modify its document. Is it coming from your domain? Otherwise you won't be able to manipulate it programatically.
Joe
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Joe