$(":input").bind("blur", function(e){
	var in_day = $("#edit-submitted-travel-details-check-in-day").attr("value");
	var in_month = $("#edit-submitted-travel-details-check-in-month").attr("value");
	var in_year = $("#edit-submitted-travel-details-check-in-year").attr("value");
	var out_day = $("#edit-submitted-travel-details-check-out-day").attr("value");
	var out_month = $("#edit-submitted-travel-details-check-out-month").attr("value");
	var out_year = $("#edit-submitted-travel-details-check-out-year").attr("value");
	
	var checkin_date = new Date();
	checkin_date.setFullYear(in_year,in_month-1,in_day);
	var checkout_date = new Date();
	checkout_date.setFullYear(out_year,out_month-1,out_day);
	$("#edit-submitted-travel-details-number-of-days").attr("value", (checkout_date - checkin_date)/1000/60/60/24);
});