function Ion(imagename) {
	document [imagename].src = "images/nav-"  + imagename + "-over.gif";
}

function Ioff(imagename) {
	document [imagename].src = "images/nav-"  + imagename + ".gif";
}


function subnavrollover(layer)	{
	document.getElementById(layer).style.background="url('images/bg-subnav.gif') #EEEEEE repeat-x";
	document.getElementById(layer).style.color='#FFFFFF';
}


function subnavrollout(layer) 	{
	document.getElementById(layer).style.background="url('images/spacer.gif') #EEEEEE repeat-x";
	document.getElementById(layer).style.color='#666666';
}

var lastID = '';
function show(id) {
	if (lastID != '') document.getElementById(lastID).style.visibility = 'hidden';
	document.getElementById(id).style.visibility = 'visible';
	lastID = id;
}

function hide(id) {
	document.getElementById(id).style.visibility = 'hidden';
}