Image fade in on button roll over and fade out on button roll off

Hello,

I have 3 buttons going around in a circle, in the middle of this circle I want a specific image to fade in for each button when you roll across it then fade out when you move off the button. I also want the button itself to change colour slightly when you roll across it. I’ve not had much look so far without the use of actionscript, but even with using it I’m not getting very far, I also seem to have a problem where once I have an image appear on the rollover of abutton that the image becomes part of the button, ie instead of the image just appearin when you roll over the button it appears when you roll over where the image should be appearing.

Thanks