Need Help Closing a Window

This is driving me crazy.
I have a popup window (part of a shopping cart) in which there is a picture 
of the item, an "Add to Cart" button, and a "Close Window" link.

When the user clicks the "Add to Cart" button, I want it to put the item in 
their shopping cart and also close the popup window.

I found the instructions for this earlier today, but I lost them.  I've 
been searching for 2 hours and can't find it.  It's a very simple thing... 
I think it was a short javascript... but I can't find it.

Can someone help?

Thanks in advance!!

-- Sandy 

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