anchor.diff:                  </div>
                   <div class="value">
                       <form:input path="period.duration.quantity" size="3" maxlength="3"/>
  -                    <form:select path="period.duration.unit">
  +                    <form:select path="period.duration.unit">                                   
                           <form:options items="${durationUnits}"/>
                       </form:select>
                   </div>
               </div>
               <div class="row even">
                   <div class="label">
  -                    <form:label path="period.repetitions">Repetitions</form:label>
  +                    <form:label path="period.repetitions">Occurrences</form:label>
                   </div>
                   <div class="tip" id="repetitionsText">
                       The number of times the days of this period will occur.
  
positive.code:                 numberOfDaysInUnit =1;
              }
              totalDays = reps * duration * numberOfDaysInUnit;
              Element.update("summary-days", totalDays + " day" + (totalDays != 1 ? "s" : ""))
              highlightOdd("summary-days")
  
              if (duration > 1) {
                  Element.update("summary-day-range", "(" + startDay + " to " + (startDay + duration * reps - 1) + ")")
              } else {
                  Element.update("summary-day-range", "(day " + startDay + ")")
              }
              highlightOdd("summary-day-range")
  
              if (reps > 1 && duration >= 1) {
                  var sameDay = [startDay]
                  while (sameDay.length < reps) {
                      sameDay.push(sameDay.last() + duration * numberOfDaysInUnit)
  
negative.code:             }
          }
  
          function disableSummaryFields(){
              Element.update("summary-beginning", "Incorrect input")
              Element.update("summary-days", "")
              Element.update("summary-day-range", "")
          }
  
          function highlightOdd(elt) {
              SC.highlight(elt, {
                  endcolor: "#eeeeee",
  