Default Thinning JB task bar

So I did upgrade from ICS to JB. Not the fresh installed.
1. prior ICS didn't support camera or mic, so I deleted/removed camera.
How can I optain one that doesnt have ads like one from playstore?
2. The new taskbar(black bar with BACK HOME HIST) is kinda thick.
How can I make it thinner so we can have more for viewing?