function validate()
{
	if (document.schedule_form.frID.value == document.schedule_form.dsID.value)
	{
		alert("The destination city cannot be the same as the departure city!");
		return false;
	}
	//check if valid dates have been picked ... flag an error if not
	var intDate = document.schedule_form.dayCMB.value;
	var intMonth = document.schedule_form.monthCMB.value;
	var intYear = document.schedule_form.yearCMB.value;
	var errorFlag = 0;
	if (!validateMonth(intDate, intMonth)) {
		alert("Please enter a valid date!");
		return false;
	}
	// check if departure date is not before today
	var now = new Date();
	var today = new Date(now.getYear(),now.getMonth(),now.getDate());
	departureDate = new Date(intYear,intMonth-1,intDate);
	if (departureDate.getTime() < today.getTime())
	{
		alert ("Please pick the correct date for your departure!");
		return false;
	}
	if (document.schedule_form.displayReturn.checked)
	{
		var intDate2 = document.schedule_form.dayCMB2.value;
		var intMonth2 = document.schedule_form.monthCMB2.value;
		var intYear2 = document.schedule_form.yearCMB2.value;
		if (!validateMonth(intDate2, intMonth2))
		{
			alert ("Please pick the correct date for your return!");
			return false;
		}
		returnDate = new Date(intYear2,intMonth2-1,intDate2);
		if (document.schedule_form.dayCMB2.value < today.getDate())
		{
		if (returnDate < departureDate)
			{
			alert ("Your return date cannot be before the departure date! \n Correct your return details.");
			return false;
			}
		}
	}
	return true;
	}
	function validateMonth(intDate, intMonth)
	{
	if (intMonth == 2 && intDate > 29 )
	{
	return false;
	}
	if (intMonth == 4 && intDate > 30)
	{
	return false;
	}
	if (intMonth == 6 && intDate > 30)
	{
	return false;
	}
	if (intMonth == 9 && intDate > 30)
	{
	return false;
	}
	if (intMonth == 11 && intDate > 30)
	{
	return false;
	}
	return true;
}