These are some what similar to those Browser type Buttons. Images change twice. First time, when you move the "mouse pointer" over an image, then again when you click it. The images revert back to original when you move the "mouse pointer" away and/or after the relevant page is loaded.
I should also tell you that recently a visitor to these pages had sent me an E-mail asking for the "source code" for a Menubar of this kind (atleast, I suppose so!!). That's how.....
Anyway, assuming this is what he/she wanted, I hope he/she returns here and picks it up. And possibly, on his/her way out, sign my Guest Book too!?!?
In the mean time, Click any of the Dummy Links & see what happens.