var topicDetail = {
	hideAll: function() {
		var details = $$('.detail');
		for (i=0;i<details.length;i++) {
			$(details[i]).hide();
		}
		var summaries = $$('.summary');
		for (i=0;i<summaries.length;i++) {
			$(summaries[i]).removeClassName('active');
		}
	},
	swap: function(oElement) {
		$('overview').addClassName('inactive');
		$('benefits').removeClassName('inactive');
		topicDetail.hideAll();
		$(oElement).addClassName('active');
		var target = oElement.id + '_detail';
		$(target).show();
	}
}