I'm using css to change the look of three buttons, using images on the buttons instead of the default. (up - arrow, down - arrow, and delete - X).

These buttons will be disabled until the user makes a selection from a list, but by using the image style its not apparent that they are disabled, because they obviously dont grey out like a normal button.

I'd like to know if there's an easy way to add another faded out image for the disabled instance?