function windowBeforeUnloadHandler() { 
	var flightmaps = getEl("flightmaps");
	if (flightmaps && flightmaps.hasUnsavedChanges()){
		return "You have attempted to leave this page. If you have made any changes to your itinerary without clicking the Save button, your changes will be lost. Are you sure you want to exit this page?";		
	}
}

window.onbeforeunload = windowBeforeUnloadHandler;