IE PNG transparency

I dont know if many of you have noticed but if you save an image as a PNG that has a transparent background and use css to position it, in firefox it works how you would expect, the background of that image will show whatever is under it. But in IE it fills that background with white. Is there a way to fix that?

Thanks in advanced

also if you think ill get better results in a different section please move this post

thank you

http://www.twinhelix.com/css/iepngfix/

Thank you very much :)

You are welcome :)