這是什麼東西，我可以全砍嗎？

其實我已經改掉一小部份了，但還是這樣一團：

  <% if prev_photo=@photo.get_prev(params[:album_id]) %>
    <% prev_photo1 = prev_photo %>    
    <% if prev_photo=prev_photo.get_prev(params[:album_id]) %>
      <% if prev_photo.id != @photo.id %>
        <%= link_to (show_photo(prev_photo, :square, :width => "75"), photo_path(prev_photo) + '.html', {:style => "padding: 0px 10px 0px 10px;" }) %>
      <% end -%>  
    <% else %>
      <% prev_photo=prev_photo1.get_last(params[:album_id]) %>
      <% if prev_photo.id != @photo.id %>
        <%= link_to (show_photo(prev_photo, :square, :width => "75"), photo_path(prev_photo) + '.html', {:style => "padding: 0px 10px 0px 10px;" }) %>  
      <% end -%>  
    <% end %>
    <% if prev_photo.id != @photo.id %>
     <%= link_to (show_photo(prev_photo1, :square, :width => "75", :alt => prev_photo1.title), photo_path(prev_photo1) + '.html', {:style => "padding: 0px 10px 0px 10px;" }) %>  
    <% end -%>
  <% else %>
    <% if prev_photo = @photo.get_last(params[:album_id]) %>
      <% prev_photo1 = prev_photo %>    
      <% if prev_photo=prev_photo.get_prev(params[:album_id]) %>
        <% if prev_photo.id != @photo.id %>
          <%= link_to (show_photo(prev_photo, :square,:width=> "75",:alt => prev_photo.title), photo_path(prev_photo) + '.html', {:style => "padding: 0px 10px 0px 10px;" }) %>
        <% end %>  
      <% end %>
    <% if prev_photo.id != @photo.id %>  
      <%= link_to (show_photo(prev_photo1, :square,:width=> "75", :alt => prev_photo1.title), photo_path(prev_photo1) + '.html', {:style => "padding: 0px 10px 0px 10px;" }) %>
    <% end -%>  
   <% end -%> 
  <% end -%>