$(function() {
  var flash = $('#top_flash');
  $.preload(['2','3'],
            { base: '/image/site/main_img/',
              ext:  '.jpg',
              onComplete: function(info) { flash.append(jQuery('<img>').attr('src', info.image)); },
              onFinish: function(info) { flash.cycle({ timeout: 1000, speed:   7000 }); }
            });
});