function slideSwitch() {
    var $active = $('#slideshow DIV.active');
    if ( $active.length == 0 ) $active = $('#slideshow DIV:last');
    var $next =  $active.next().length ? $active.next()
        : $('#slideshow DIV:first');
   $active.addClass('last-active');
   $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 500, function() {
            $active.removeClass('active last-active');
        });
}

$(document).ready(function(){
	$('div#slideshow').append('');

	$(function() {
    	setInterval( "slideSwitch()", 4000 );
	});
});