Drop Down Text Effects

Hi there.

I'm created topics currently that have drop down text effects in them.

Basically, I have a title which has got a little image next to it (a plus expand sign image).

When you click either the image of the title text, the drop down text appears as intended.

Is there anyway I can get it, so that when you click either the text or the image, the image changes to be a minimise image?

The screenshots below demonstrate what I mean a bit clearer.

Thanks very much,

Craig