var $j = jQuery.noConflict();

function slideSwitch() {
    var $jactive = $j('#slideshow div.active');

    if ( $jactive.length == 0 ) $jactive = $j('#slideshow div:last');

    var $jnext =  $jactive.next().length ? $jactive.next()
        : $j('#slideshow div:first');

    $jactive.addClass('last-active');

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

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