# File app/helpers/conferences_helper.rb, line 107
  def link_for_logo(conf, size)
    %w(data medium thumb).include?(size) or
      raise Exception, _('Invalid logo size specified: %s') % size 

    logo = conf.logo or return ''
    '<img src="%s" width="%s" height="%s" />' % 
      [ url_for(:controller => 'logos', :action => size,
                :id => logo.id), 
        logo.send("#{size}_width"), logo.send("#{size}_height") ]
  end