// -----------------------------------------------------------------------------------------
// functions
// -----------------------------------------------------------------------------------------

function DisableValidator(strIdValidator)
{
	var objValidator = document.getElementById(strIdValidator);
	if (objValidator)
		objValidator.enabled = false;
}

function EnableValidator(strIdValidator)
{
	var objValidator = document.getElementById(strIdValidator);
	if (objValidator)
		objValidator.enabled = true;
}

function SynchronizeByArrivalDate()
{
	if (!objArrivalDate || !objDepartureDate || !objDuration)
		return false; 
	
	if (objArrivalDate.value != "")
	{
		// verify that objArrivalDate.value is a date
		if (isDate(objArrivalDate.value))
		{
			if (objDuration.value != "")
			{
				// verify that duration is an Int
				if (isInt(objDuration.value))
				{
					var intDuration = parseInt(objDuration.value, 10);
					if (intDuration > 0)
					{
						var strDate = AddDays(objArrivalDate.value, intDuration);
						objDepartureDate.value = strDate;
						
						return true; // departure date synchronized
					}
					else 
						return false; // nothing todo
				}
				else
					return false; // wrong format (duration)
			}
			else
			{
				if (objDepartureDate.value != "")
				{
					// verify that objDepartureDate.value is a date
					if (isDate(objDepartureDate.value))
						objDuration.value = GetDays(objArrivalDate.value, objDepartureDate.value);
					else
						return false; // wrong format (departure date)
				}
				else
					return false; // nothing todo
			}
		}
		else
			return false; // wrong format (arrival date)
	}
	else
		return false; // nothing todo
}

function SynchronizeByDepartureDate()
{
	if (!objArrivalDate || !objDepartureDate || !objDuration)
		return false; 
		
	if (objDepartureDate.value != "")
	{
		// verify that objDepartureDate.value is a date
		if (isDate(objDepartureDate.value))
		{
			if (objArrivalDate.value != "")
			{
				// verify that objArrivalDate.value is a date
				if (isDate(objArrivalDate.value))
				{
					objDuration.value = GetDays(objArrivalDate.value, objDepartureDate.value);
					
					return true; // duration synchronized
				}
				else
					return false; // wrong format (arrival date)
			}
			else
				return false; // nothing todo
		}
		else
			return false; // wrong format (departure date)				
	}
	else
		return false; // nothing todo
}

function SynchronizeByDuration()
{
	if (!objArrivalDate || !objDepartureDate || !objDuration)
		return false; 

	if (objDuration.value != "")
	{
		// verify that duration is an Int
		if (isInt(objDuration.value))
		{
			if (objArrivalDate.value != "")
			{
				// verify that objArrivalDate.value is a date
				if (isDate(objArrivalDate.value))
				{
					var intDuration = parseInt(objDuration.value, 10);
					if (intDuration > 0)
					{
						var strDate = AddDays(objArrivalDate.value, intDuration);
						objDepartureDate.value = strDate;
				
						return true; // departure date synchronized
					}
					else 
						return false; // nothing todo
				}
				else 
					return false; // wrong format (arrival date)
			}
			else
				return false; // nothing todo
		}
		else
			return false; // wrong format (duration)
	
	}
	else
		return false; // nothing todo
}