var ct_image_dir = new Image();
	ct_image_dir.src="img/fe.gif";
var ct_image_diropen = new Image();
	ct_image_dir.src="img/fc.gif";
var ct_image_item = new Image();
	ct_image_dir.src="img/d.gif";

function setExpandedIco(id)
{
	var i=document.getElementById(id+'_codethat_image');
	i.src='img/fe.gif';
}

function setCollapsedIco(id)
{
	var i=document.getElementById(id+'_codethat_image');
	i.src='img/fc.gif';
}

function toggleNode(id)
{
	if(toggleLayer(id+'_codethat_subitems')) {
		setExpandedIco(id);
		fieldname=id+'_codethat_subitems';
	}	else {
		setCollapsedIco(id);
		document.categories.elements[fieldname].value = 'off';
	}
}

function toggleLayer(id)
{
	var l=document.getElementById(id);
	var s=l.style||l;
	if(s.visibility=='hidden') {
		s.visibility='visible';
		s.display='block';
		return true;
	}	else {
		s.visibility='hidden';
		s.display='none';
		return false;
	}
}