Drop Down Menu does not work in IE6

[kkbrooner72]

Hi,
I am just learning CSS and java script and have put together a page from some templates in order for me to understand how Java and CSS all link to form a good webpage. The drop down menus work fine in firefox but are not transparent in IE6, I have tried a number of options but can't get to work. Can someone please help! I have attatched CSS file and XHTML file