for some reason when i view this site (http://willowbilliards.com/) in IE 7 or 6, the background for the top nav bar appears in white, and then you cant see the text. someone also reported that they were seeing the same thing in IE 8, even though when i look at it in IE8, i see the correct transparent png with the diamonds.

so how do i fix it so that the transparent diamond pic shows up for everyone in IE 8, 7 and 6????

please advise. thanks in advance!