Orbit/app/views/mobile/index.mobile.erb

<div id='slideshow-<%= @ad_banner.title.dehumanize %>' class="orbit-cycle-slideshow"  data-cycle-timeout="<%= @ad_banner.timeout_millisecond %>" data-cycle-fx="<%= @ad_banner.ad_fx %>" data-cycle-random='true' style="z-index: 0">
  <% @ad_banner.ad_images.can_display.each do |image| %>
    <%= image_tag image.file.url, width: @ad_banner.width, height: @ad_banner.height %>
  <% end %>
</div>
<div class="newlist clear">
  <% @bulletins.each do |bulletin| %>
    <div class="newitem">
      <div class="newpic">
        <%= image_tag bulletin.image.url %>
      </div>
      <h3 class="newstitle">
        <%= link_to bulletin.title, mobile_announcement_content_path(:app => params[:app], :id => bulletin) %>
      </h3>
      <p class="newsDate"><%= display_date(bulletin.postdate) %></p>
      <div class="newsummary"><%= bulletin.subtitle %></div>
    </div>
  <% end %>
</div>

<script type='text/javascript'>
  $(function(){
    if($("#slideshow-<%= @ad_banner.title.dehumanize %> img").length > 1){    
      var a = [];
      <% @ad_banner.ad_images.can_display.each do |image| %>
        a.push("<%= image.file.url %>");
      <% end %>
      $.preload(a, 2, function(){
        $('.orbit-cycle-slideshow').cycle();
      });
    }
    else{
      $("#slideshow-<%= @ad_banner.title.dehumanize %> img").show()
    }
  });
</script>