function myFunction () {
	var arr_field = document.getElementById( 'arrival' ).value;
	document.getElementById( 'departure' ).value = arr_field;
	}

function CheckInput () {

	var arr_field = document.getElementById( 'arrival' ).value;
	var dep_field = document.getElementById( 'departure' ).value;
	var jetzt = new Date();

	var Tag   = jetzt.getDate();
	var Monat = jetzt.getMonth()+1;	
	var Jahr  = jetzt.getFullYear();	
	jetztDatum = Monat + "/" + Tag + "/" + Jahr	
	xx = Date.parse(jetztDatum);

	Tag = arr_field.substr(0,2);
	Monat = arr_field.substr(3,2);
	Jahr = arr_field.substr(6,4);
	USDatumArr = Monat + "/" + Tag + "/" + Jahr
	
	Tag = dep_field.substr(0,2);
	Monat = dep_field.substr(3,2);
	Jahr = dep_field.substr(6,4);
	USDatumDep = Monat + "/" + Tag + "/" + Jahr		
	//alert(USDatumArr);
	//alert(jetztDatum);

	if (arr_field == "") {
      alert("arrival date missing.");
      return false;
	  }
	else{
		if (Date.parse(USDatumDep) < xx) {
			document.getElementById( 'departure' ).value = "";
			}
		if (Date.parse(USDatumArr) < xx) {
			document.getElementById( 'arrival' ).value = "";
			alert("arrival date must be today or later.");
			return false;
			}
		}
	  
	if (dep_field == "") {
      alert("departure date missing.");
      return false;
	  }
	else{
		if (Date.parse(USDatumArr) < xx) {
			document.getElementById( 'arrival' ).value = "";
			}
		if (Date.parse(USDatumDep) < xx) {
			document.getElementById( 'departure' ).value = "";
			alert("departure date must be tomorrow or later.");
			return false;
			}
		}
		
	if(Date.parse(USDatumDep) <= Date.parse(USDatumArr)) {
		document.getElementById( 'arrival' ).value = "";
		alert("arrival must be one day before departure or earlier.");
		return false;
		}
		
	return true;
	}