Forum Moderators: mack
Tried various things with transparency, bgcolor, style="background-color:..." and so on. Nothing worked.
What works for me is, on teh page with the iframe
<BODY onLoad="document.iframe1.location='blur.html'">
where blur.html is a one-line html file which simply fills the screen with the background colour that you want the iframe to have.
Once the user makes a choice, this content of the iframe is discarded, so that's cool.