i think (if you're looking closely) there must 4px be missing on the right and bottom, right?
3D effects are easily possible with the use of shadows. i had a short look into transparency a few pages before. but none of the commands worked for me. you could try some of them too and place them in various ways (on top, middle, bottom). (i would say that the moz-opacity command is the right one because rtcom uses some moz-commands yet but maybe i'm wrong with my logic ^^)