Transparent png IE css background

I have a transparent png as the background for a div (set in a css stylesheet) which works lovely in FF etc.

IE now screws with it. I know you can do something with alpha transparencies etc, but I can't see how to manage this for the background-image.

Any ideas??

Cheers

The Moose

http://www.hongkiat.com/blog/making-png-image-transparency-work-in-internet-explorer/

vineet