function doDateCheck(arrive, depart) {
if (Date.parse(arrive.value) <= Date.parse(depart.value)) {
alert("The selected date range is valid. Please complte the form and submit.");
}
else {
if (arrive.value == "" || depart.value == "") 
alert("Both dates must be entered.");
else 
alert("DEPARTURE  date must occur after the ARRIVAL date.");
   }
}