this is what i want to do:
Basically i want to have a description of each button appear when the mouse hovers over it. For example, say i have the hover button at the top of the page and a image shown at the bottom of the page. What i want to do is when the button at the top is hovered over i not only want the hover button image to change i want to change the image at the bottom as well. When the cursor is moved off the button at the top the image at the bottom will change back to the origional one.

I made a sample page at http://programming.arnett.nu/html/rollover that I think does what you want to do.

I don't have time to convert the code so that it will display here, so you'll need to view the page and 'view source'.