Background Color and Google Sites

I have embedded (dynamically) my tag cloud into a google site (using iframe) but the background is showing up white instead of transparent. I made sure to select transparent for background color under 'colors and animations' menu. I have also tried adding transparent background tag in the html, with no luck. I also have tried switching to another color but the cloud background still showed up white. Is it because I used iframe? Am I doing something else wrong? Please help! I am so close to embedding a really awesome cloud into my site.

I guess the issue with transparency is related to iframe or flash.
Could you please provide the code you used?

Thanks for the reply but I figured it out. For anyone else with a similar issue you can use the iframe wrapper gadget.