<!--

	function check_form()
	{
		var error = false;
		
		if (document.getElementById('iata').value == '')
		{
			alert('Please enter the airport IATA (3 letter code)');
			error = true;
		}
		
		if (document.getElementById('icao').value == '')
		{
			alert('Please enter the airport ICAO (4 letter code)');
			error = true;
		}
		
		if (document.getElementById('airport-name').value == '')
		{
			alert('Please enter the airport name');
			error = true;
		}
		
		if (document.getElementById('opening-paragraph').value == '')
		{
			alert('The opening paragraph is a required field. Please enter a short introuction to the guide.');
			error = true;
		}
		
		if (error)
			return false;
		else
			return true;
	}

-->