function slideSwitch(){
 var $active = $('#slideshow img.active');
 var $next = $active.next();
 
 var $next =  $active.next().length ? $active.next(): $('#slideshow img:first'); 

 $active.addClass('last-active');
 
 $next.css({opacity: 0.0})
      .addClass('active')
      .animate({opacity: 1.0}, 1000, function(){
		  $active.removeClass('active last-active');
		});
}

jQuery(document).ready(function(){
			
			$('.lightbox').lightBox();
			
			$(function(){
	  setInterval( "slideSwitch()", 4000 );
      });

        });