$(document).ready(function(){
    $("#menu li").hover(
        function(){ $("ul", this).fadeIn("fast"); }, 
        function(){ $("ul", this).fadeOut("fast"); } 
    );
    if (document.all) {
        $("#menu li").hoverClass ("sfHover");
    }
});

$.fn.hoverClass = function(c) {
    return this.each(function(){
        $(this).hover( 
            function() { $(this).addClass(c);  },
            function() { $(this).removeClass(c); }
        );
    });
};    
/* 
Code Highlighting 
Courtesy of Dean Edwards star-light 
http://dean.edwards.name/my/behaviors/#star-light.htc
    - with jQuery methods added, of course
*/