I have experimented in a variety of ways, and when I use the opacity CSS attribute, it kills the next level of the menu in IE6, FF as always no prob.
Thus, when I had the CSS opacity code to <ul>, <li> does not appear. If I add it to <ul><li>, then the second level (<ul><li> <li>) does not appear. The menu's next level does not slide down, or out... E.g. I am adding: .sf-menu li li { filter: alpha(opacity=80); } to the Custom CSS field in the Joomla mod_superfishmenu module. I am using jQuery 1.2.6 and loading all SuperFish JS after mootools.js I have also tried add it directly to superfish.css. Any ideas or confirmation this problem exists for others out there?? I would love to add the animation, but can't get beyond opacity. Thx! Great script!