var city = function($){
	/**
	 * private methods and variables
	 */
	var priv = {
	    selectedPromotion : 1
	};
	
	/**
	 * public methods
	 */
	return {
	    switchPromotion : function(item)
	    {
	        var newClass = '';
	        var oldClass = '';
	        if (item == 1)
	            newClass = 'first';
	        else if (item == 2)
	            newClass = 'second';
	        else
	            newClass = 'third';
	        if (priv.selectedPromotion == 1)
	            oldClass = 'first';
	        else if (priv.selectedPromotion == 2)
	            oldClass = 'second';
	        else
	            oldClass = 'third';
	        
	        if (item == priv.selectedPromotion)
	        {
	            return;
	        }
            //scroll current selected up, newly selected down
            $('.promotion-' + oldClass).slideUp();
            $('.promotion-' + newClass).slideDown();
	        priv.selectedPromotion = item;
	        $('#accordion h3.active').removeClass('active');
	        $('#accordion h3.' + newClass).addClass('active');
	    }
    }
}(jQuery);