Custom Button Area

Is it possible to set the clickable area of a button? In my GUI, The transparent area of a circular image button overlaps the transparent area of another nearby button. This causes two of them to be highlighted when the mouse is over both of them.

The optimum solution would allow me to define the clickable area as only fully opaque portions of the image. However, if this is impossible (or ridiculously complicated), an acceptable solution would allow me to minimize the clickable area to prevent overlap.

Much appreciated!

You could just use the images as GUITextures, and have transparent Buttons over them, in the size you need.

(Edit the GUISkin you're using, or create a new one to use if you're using the default, and remove all the background images from the "Button" style to get a transparent button)