I know this is just a cosmetc question but when I make a link on my dexktop how do I get rid of the little green arrows that are automatically put there?

Also, I've seen screen shots of the bar at the bottom of the desktop transparat, I can do that but when I open an app, the blocks of programs is always gray. How can I make those transparant too?

Oh yeah I'm using Gnome with fedora core 2.