$(document).ready(function(){

  /**
   * 'suckerfish' navigation enhancements
   * the 'sfhover' css class is for ie [version?] support
   */
  $('nav li').hover(
  
    /**
     * mouseenter callback:
     */
    function() {
      $(this)
        .addClass('sfhover')
        .find('ul')
          .hide()
          .fadeIn();
    },
    
    /**
     * mouseleave callback:
     */
    function() {
      $(this)
        .removeClass('sfhover');
    }
    
  );
  
});