<div class="openSource_2" style="background: url('<%= named_attachment_path(@images[index], @images[index].try(:filename)) %>') no-repeat top center;"></div>
<% index += 1 %>
<div class="openSource_3" style="background: url('') no-repeat top center;">
<% @competition.competition_stages.each_with_index do |stage, i| %>
<div class="openSource_<%= index + 1 %>" style="background: url('<%= named_attachment_path(@images[index], @images[index].try(:filename)) %>') no-repeat top center;">