// Validate course form
function validateform(courseform)
{	
	if (!validRequired(courseform.tee_date,"tee date"))
		return false;
	
	if (!validRequired2(courseform.tee_time,"preferred tee time"))
		return false;
	
	if (!validNum(courseform.no_players,"number of players",true))
		return false;
	
	return true;
}

// Validate car form
function validateform(carform)
{
	if (!validRequired(carform.orig_airport,"orig_airport"))
		return false;
		
	if (!validRequired(carform.orig_airline,"orig_airline"))
		return false;	
		
	if (!validRequired(carform.orig_flight_no,"orig_flight_no"))
		return false;	
		
	if (!validRequired(carform.dept_airline,"dept_airline"))
		return false;
		
	if (!validRequired(carform.dept_flight_no,"dept_flight_no"))
		return false;
		
	if (!validRequired2(carform.up_city,"pick up point"))
		return false;
	
	if (!validRequired(carform.up_date,"pick up date"))
		return false;
	
	if (!validRequired2(carform.up_time,"pick up time"))
		return false;
	
	if (!validRequired(carform.drop_date,"drop off date"))
		return false;
	
	if (!validRequired2(carform.drop_time,"drop off time"))
		return false;
	
	if (!validNum(carform.no_golfers,"number of golfers",true))
		return false;

	if (carform.drop_date.value < carform.up_date.value)
	{
		alert ('Please select a vaild drop off date that occurs on or after your chosen pick up date');
		carform.drop_date.focus();
		return false;
	}
	
	if (carform.drop_time.value > carform.up_time.value)
	{
		alert ('Dropping your car off later than the pick up time incurs a charge equivalent to one days hire');
		carform.drop_time.focus();
	}
	
	return true;
}

// Ensure a value is entered in required fields
function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Please enter a value for the ' + fieldLabel +' field.');
		formField.focus();
		result = false;
	}
	
	return result;
}

// Ensure a value is selected from dropdown lists
// Same as validRequired - just text output changed
function validRequired2(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Please select a value for the ' + fieldLabel +' from the dropdown list.');
		formField.focus();
		result = false;
	}
	
	return result;
}

// Set valid characters to be numbers
function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}


// Check string to ensure no invalid characters
function inValidCharSet(str,charset)
{
	var result = true;

	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	return result;
}


// Check value entered is a number
function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the ' + fieldLabel +' field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}