If you want to create a new images pack, then you need add to all images right suffixes. As example you add button with name
123. So, images must have the next names:
123,
123_Over,
123_Down.
Finally, you need use this template:
Код:
<button action="bypass blablabla" width=120 height=34 back=MyImagePack.123_Down fore=MyImagePack.123>
Image with
_Over suffix will be used automatically when you press the button.