jQuery(document).ready(function(){
    // Navigation logic
    jQuery('#NavList > li').hover(
        // Mouse over
        function(event) {
            jQuery('#NavList li > ul').css('visibility', 'hidden');
            jQuery('#' + this.id).children('ul').css('visibility', 'visible');    
        },
        // Mouse out
        function(event) {
            jQuery('#NavList li > ul').css('visibility', 'hidden');
            jQuery('#NavList li.act').children('ul').css('visibility', 'visible');
        }
    );
});