This post is for the folks who want to deploy MOSS without changing the default master page for Blue Band. Please change just one thing...the search button hover state:

Normally it looks like this:

...and when you hover...

Somebody forgot to set the GoImageActiveUrl on the SearchBoxEx control...set it like this:

and while you are in there set the one for RTL languages too:

Now your hover state is the same as your default state.