$(function() // Register the menu
      {
// Add the click event handler on the list item with sub list
$('li:has(ul)') 
           .click(function(event){
            if (this == event.target) {
               // Hide all the children of the other lists
               $('li:has(ul)').children().hide('fast'); 
               // Make the animation
               $(this).children().animate({opacity:'toggle',height:'toggle'},'fast'); 
                                      }
                     //return false;
                     return true;
                                 }
                   )
            // Change the cusrsor.
           .css({cursor:'pointer'})
           // Hide all the nested lists (on the first tinm only).
           .children().hide();
       }
 );