The website: http://club16.abcguide.com/
The drop down menu items appear behind the Flex slider in IE 8 for the client, and IE 7 in my compatibility tester.
Help is appreciated in regards to this, thanks!
Unless the z-index is explicitly set for positioned elements, IE7/8 will give the positioned element a z-index of 0.
Add position: relative; z-index: 99999; to #navigation-wrap to ensure it has a z-index greater than the other elements on the page. This will ensure it stays on top.