function changeSlide() {    
        var $active = $('#content-billboard DIV.active');

        if ( $active.size() == 0 ) {
            $active = $('#content-billboard DIV:first');
        }
        else {
        }
        
        $active = $active.eq(0);
  
        var $next = $active.next().length ? $active.next() : $('#content-billboard DIV:first');
        $active.addClass('last-active');
        $next.css({opacity: 0.0})
          .addClass('active')
          .animate({opacity: 1.0}, 2000, function() {
              $active.removeClass('active last-active');
              setTimeout("changeSlide()", 4000);
          });
        }
        
      $(function() {
        if( $('#content-billboard DIV').size() > 1 ) {
            setTimeout("changeSlide()", 4000);
        }
      });