//slide
function slide() {
    var $active = $('#banner IMG.active');
    if ( $active.length == 0 ) $active = $('#banner IMG:last');
    var $next =  $active.next().length ? $active.next()
        : $('#banner IMG:first');
   $active.addClass('last-active');
   
   $next.css({ opacity: 0.0 })
        .addClass('active')
        .animate({ opacity: 1.0 }, 3000, function() {
            $active.removeClass('active last-active');
        });
}