function slideSwitch(target) {
                var current = $(target + ' .slide:eq(0)');
                var next = $(target + ' .slide:eq(1)');
                $(target).append(current);
                next.fadeIn(4000);
                current.fadeOut(4000);
            }
            $(function() {
                setInterval("slideSwitch('#box1')", 4000 );
                setInterval("slideSwitch('#box2')", 4000 );
                setInterval("slideSwitch('#box3')", 4000 );
                setInterval("slideSwitch('#box4')", 4000 );
            });