function ajaxTariffSwap() {
	selectBox = document.getElementById('tariffSwap')
	tariffsRoomSelected = selectBox.selectedIndex;
	
	document.getElementById('tariffRoomTitle').innerHTML = tariffRooms[tariffsRoomSelected][1];									
	document.getElementById('tariff').innerHTML = tariffRooms[tariffsRoomSelected][0];
}