function slideSwitch()
{
     var $active = $('#toumuSlide img.active');
     if ( $active.length == 0 ) $active = $('#toumuSlide img:last');
     var $next =  $active.next().length ? $active.next() : $('#toumuSlide 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() {
     setInterval( "slideSwitch()", 4000 );
 });