SDmenu is working with IE but not with NS or FF?

[nxs]

1) Script Title: SDmenu

2) Script URL (on DD): http://www.dynamicdrive.com/dynamicindex1/slashdot.htm

3) Describe problem: I have implemented the script. it works great and looks great in IE7. But with NS9 or FF2 it does not show. i only get the links and the button titles.

I saw the menu working in NS and also in FF on DD. Why not on my website?

some help would really be appreciated

btw.. my menu can be found here: http://www.nxshardcore.com/main2/start.php