colorbars

Hi there. I read all of the rules and it didn't say anything about slightly off-topic questions, but if this isn't allowed, I'll remove it. I've been using PS7 for a while to make icons and other assorted graphics, but I cannot seem to figure out how to make colorbars. I was wondering if some very nice person with some extra time would mind helping me out a bit. Either a basic tutorial or just some quick pointers would greatly appreciated.

Thanks in advance. :)