/* = Class.create();
Extension.prototype */
var Extension = {
	expandCollapse : function (params) {
		// expanded div 'id'
		if (params == undefined) {
			params = {};
		}
		if ($(params.id).visible()) {
			Effect.SlideUp(params.id);
			$(params.expand).removeClassName('opened');
			$(params.expand).addClassName('closed');
		} else {
			Effect.SlideDown(params.id);
			$(params.expand).removeClassName('closed');
			$(params.expand).addClassName('opened');
		}
	}
}