bdelay=3000;
slideint=setInterval( "slideSwitchNext()", bdelay);

function slideSwitchNext()
{
    var $active = $('#header div.active');

    if ( $active.length == 0 ) $active = $('#header div:last');
    var $next =  $active.next().length ? $active.next() : $('#header div:first');

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

    $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 500, function() {
            $active.removeClass('active last-active');
        });
}