organizer.SelectionManager = function() {
    this.selectionMap_ = {};
  };
  
  organizer.SelectionManager.prototype.select = function(id) {
    this.selectionMap_[id] = id;
    $('#' + id).addClass('ui-selected');
  };
  
  organizer.SelectionManager.prototype.unselect = function(id) {
    delete this.selectionMap_[id];
    $('#' + id).removeClass('ui-selected');
  };