HOVER OVER!

Hello all,

Was just wondering.. Im making my buttons for my nav bar. Is there a way to add another image for when someone is hovering over the button?

As you can see i have our logo behind our FORUMS button www.worx.tk , i want to remove that but when someone hovers over one of the buttons it will appear. Obviously i will make another set of images with the logo behind.

Hope i have explained enough.

Also why im here. Is there a way to remove a button from the nav bar..at the minute i have the buttons i dont want on there set so only admins can see them. But is there a way to actually remove them altogether?

Thanks
Chris