Is it possible to create a pop-up window that has a transparent background?

[NEONecd999]

Is it possible to create a windowless window (chrome window I guess) that has a transparent background?

Or even so, a pop-up window (doesn't have to be windowless) that has a transparent background, or the background shows what is behind the window?

Thanks for your help.

[Khalid Ali]

Never tried it in thissituation,however you can try using css
background: transparent;

and see if it works for window as well.

[PeOfEo]

I am willing to bet that it will never work on ie even if it is possible on other browsers.