Ok, I wanted to know if there were any ways I could have an I frame 50% transparent ? I mean, I want the bg of that frame, let say blue, but see-trought... Is there a way to do that ?

style="filter: alpha(opacity=50%);"
Add that to the iframe tag. This changes the opacity of everything inside the iframe as well, so if you want just the background changed it's better to do it in a graphics program.

Crap... Oh, thanks anyways !!