function slideSwitch1() {
    var $active = $('.banner1 IMG.active');
    if ( $active.length == 0 ) $active = $('.banner IMG:last');
    var $next =  $active.next().length ? $active.next()
        : $('.banner1 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 slideSwitch2() {
    var $active = $('.banner2 IMG.active');
    if ( $active.length == 0 ) $active = $('.banner IMG:last');
    var $next =  $active.next().length ? $active.next()
        : $('.banner2 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 slideSwitch3() {
    var $active = $('.banner3 IMG.active');
    if ( $active.length == 0 ) $active = $('.banner IMG:last');
    var $next =  $active.next().length ? $active.next()
        : $('.banner3 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 slideSwitch4() {
    var $active = $('.banner4 IMG.active');
    if ( $active.length == 0 ) $active = $('.banner IMG:last');
    var $next =  $active.next().length ? $active.next()
        : $('.banner4 IMG:first');
        $active.addClass('last-active');

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