transparent images fix for IE 6?

I have a website wich has round images with transparent edges, the problem is that in IE 6 the transparent borders shows in color.

is there a way to fix it?

thanks.

Are they actual images or are they background images?

Post a link to your page to get a quick help!

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

thanks. I just changed the image from png to gif.