[NoFeaR]

First i'm sorry if i could not get your question well. If so, try to explain it better and more simply.

So, 1st of all, the idea about transperency. Style XP offers such function about making the taskbar transperent.

THEN

2nd, hiding the taskbar, or at least to hide it only behind maximized windows:

Start -> Control Panel ->Taskbar and Start Menu

THere are few options, you may look around for them if you need them. But expecially one of them: "Keep the taskbar on top of other windows". I hope this is what you need.

So, hope I could help you or if i dunno, you may try to explain again.