function on(n)
{
	if (n=='north')	{s1('_north');mapt.innerHTML='Northumberland';}
	if (n=='lake')		{s1('_lake'); s2('_lake','');mapt.innerHTML='Lake District';}
	if (n=='york')		{s2('_york','_york');mapt.innerHTML='Yorkshire';}
	if (n=='peak')		{s3('_peak');mapt.innerHTML='Peak District<br/> and Derbyshire';}
}

function off()
{
	s1('','');
	s2('','');
	s3('','');
}

function s1(n1) {
	document.images.north.src = "map/noe_north" + n1 + ".gif"; }

function s2(n1,n2) {
	document.images.lake.src = "map/noe_lake" + n1 + ".gif";
	document.images.york.src = "map/noe_york" + n2 + ".gif"; }

function s3(n1) {
	document.images.peak.src = "map/noe_peak" + n1 + ".gif"; }