Icons on dialog buttons

Hi I was wondering if anyone knew how to put an icon (a picture) on a dialog button.

I want to to use dialog buttons to select your hero but i want the player to see what the hero looks like before they select it.

Ive seen it done before, but i cant remember where. Its some sort of script that call it up i think.

Thanks

wow.. err what do you mean by dialouge buttons? im confused... hours of skining has drained my brain..

If you mean icon buttons (Any button... graphiics on them and all i think) then you can actually skin them. i have some skinned buttons on my map!

No this is what i mean. Here i made picture.

I want the hero icon/button picture to be on the dialog button. Those are dialog buttons in the screen shot.

I know there is a way to put icons on there with some script or something, i just dont know what it is.

Does anyone Know?