anchor.diff:          <div class="span2">
             <%= link_to_previous_year(year) %>
           </div>
  -        <div class="span3 offset1">
  +        <div class="span3">
             <button id="save" class="btn btn-success"><%= button_label %></button>
           </div>
  -        <div class="span4">
  +        <div class="span3">
             <%= link_to_icalendar_export %>
  +        </div>
  +        <div class="span2">
  +          <button id="halfdays" class="btn" rel="popover" title="Halbe Tage markieren" data-content="Klicke hier, um bereits markierte Tage auszuwählen, die nur halb zählen." data-trigger="hover" data-placement="top">&#xbd; Tage markieren</button>
           </div>
           <div class="span2">
             <%= link_to_next_year(year) %>
  
positive.code:         <div class="span12 form-inline">
            <span class="label label-success">Los geht's:</span>
            Klick deine Urlaubstage für <%= year %> einfach an.
            <span class="label label-important">Neu:</span>
            <button class="btn btn-link" id="halfdays">Halbe Tage.</button>
            <label for="region">Feiertage anzeigen für:</label>
            <select id="region" class="medium">
              <option name="de_by">Bayern</option>
  
negative.code:     $(function() {
        var toggle_vacation_class = "vacation";
        $("#copy").popover({trigger: 'manual', placement: 'top'});
        $("#halfdays").popover();
  
        $("#halfdays").click(function() {
          $(".vacation, #save").expose({
  