function updateSearchBy (id)
{
	document.getElementById('destination').disabled = 'disabled';
	document.getElementById('search_destination').style.display = 'none';
	document.getElementById('cruise_line').disabled = 'disabled';
	document.getElementById('search_cruise_line').style.display = 'none';
	document.getElementById('travel_type').disabled = 'disabled';
	document.getElementById('search_travel_type').style.display = 'none';

	document.getElementById(id).disabled = '';
	document.getElementById('search_' + id).style.display = 'block';
}