anchor.diff:    headers_height = header_height
     show_weeks = false
     show_days  = false
  +  show_day_numbers = 
   
     if @gantt.zoom > 1
       show_weeks = true
  
positive.code:     height = g_height + header_height - 1
      wday = @gantt.date_from.cwday
    %>
    <% (@gantt.date_to - @gantt.date_from + 1).to_i.times do %>
      <%
        width =  zoom - 1
        style  = ""
  
negative.code:     %>
      <%= content_tag(:div, :style => style, :class => clss) do %>
        <%= day_letter(wday) %>
        <% if show_day_numbers %>
          <br />
          <%= (day).mday %>
        <% end %>
      <% end %>
      <%
        left = left + width + 1
  