function updateDifDay( DivID ){
	if (document.frm.arrival_date.value != "" && document.frm.departure_date.value != "") {
		document.getElementById( DivID ).innerHTML = Math.round((getDateFromFormat(document.frm.departure_date.value, "dd/MM/yyyy") - getDateFromFormat(document.frm.arrival_date.value, "dd/MM/yyyy")) / 1000 / 60 / 60 / 24);
	}
	else {
		document.getElementById( DivID ).innerHTML = 0;
	}
}