Backdrop for Synthesis

I set a background for the Synthesis skin, and on IE, the Blue is transparent, but on Firefox, it's solid...

So, on Firefox, I can see a few glimpes of my background rather than near the whole thing with IE...

Can this be corrected? I can't seem to locate anything.

To the extent of my knowledge, only IE supports filters. If you don't use IE or a browser that uses IE, all you get is a background.

Bah.

Alright, thanks.