Close pop-up window -> trigger action in parent window

[DjBobo]

Hi guys, I'm creating a portfolio flash website which contains a number of pop-up windows containing my works. When the user clicks on a work, the window fades to 75% black and a new pop up window (_child) appears in the center of the screen containing my work (photo/illustration etc.). I have that working fine. I'm using a fade animation sitting inside a movieclip. The problem is that when the user closes the _child window, I'd like the _parent window to fade back to how it was before (0% black). Is this possible? What's the best approach?

My thoughts are that maybe it is possible to have the built-in browser close window button trigger off some actionscript in the parent window? It's probably a mix of javascript and actionscript.

Can anyone help?

Thanks...