Hotspot colour change

I'm sure it would be possible but wouldn't have a clue how to do it.

I would like each of the hotspots on an image to change appearance (colour, shade, circle etc.) once they have been pressed so that the learner knows where they have been. I notice that the functionality is built into some of the self populating menus on pages.

Any help greatly appreciated

Regards,
Graeme

I meant to reply back to this with the answer and forgot. Thanks to Fay for sorting this one out.



I've used this with borders and backgrounds with opacity and both work just fine