function slideSwitch() {
    var $numberimages = $('#slideshow IMG');
    if ( $numberimages.length != 1 )
	{
	    var $active = $('#slideshow IMG.active');

	    if ( $active.length == 0 ) $active = $('#slideshow IMG:last');

	    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');
	        }); 
	}
}

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