PNG background causing problems in IE6

[mrtopher]

I'm using a transparent PNG background image in a website we recently developed http://www.comprehensivecardiology.com. In this site I am using a PNG image as the main background of the container so that it doesn't interfear with the window background.

This is working perfectly in FF and IE7 however in IE6 it's not allowing users to click on any of the page links. Where the background stops users are able to click links again... VERY STRANGE. Anyone know whats going on??

[Kravvitz]

Check these out:
http://www.satzansatz.de/cssd/tmp/al...nsparency.html
http://www.hrunting.org/csstests/iealpha.html