urvi, unfortunately you cant make the top bar transparent.
the only way you can make it "transparent" is if you have a dedicated background image that you wanna permanently use in conjunction with the top bar because the top bar will have to be part of the background image but photoshopped with the illusion that its transparent.. get what im saying? so basically right now we cant make true transparent top bars.
an example of what im talking about you can see in my old WA2 theme "Broken Glass"
http://forum.ppcgeeks.com/showthread...t=broken+glass