function addActivity(where) {
  if(isNaN(activities[where])) { activities[where]=0; }
  activities[where]++;
  var activityHTML = new String();
  activityHTML = '<tr class="activities" style="color: #666666;">\n';
  activityHTML += '  <td><input type="text" value="HVEM" name="'+where+'_'+activities[where]+'_who" /></td>\n';
  activityHTML += '  <td><input type="text" value="HVA" name="'+where+'_'+activities[where]+'_what" style="width: 80px;" /></td>\n';
  activityHTML += '  <td><input type="text" value="20. Oktober 2006" name="'+where+'_'+activities[where]+'_when" style="width: 100px;" /></td>\n';
  activityHTML += '  <td>kl <input type="text" value="22.00" name="'+where+'_'+activities[where]+'_time" style="width: 40px;" /></td>\n';
  activityHTML += '</tr>\n';
  alert(activityHTML);
}