var ct_image_dir = new Image();
ct_image_dir.src="http://www.satdsl.cz/css_img/fe.gif";

var ct_image_diropen = new Image();
ct_image_dir.src="http://www.satdsl.cz/css_img/swb_fc.gif";

var ct_image_item = new Image();
ct_image_dir.src="http://www.satdsl.cz/css_img/swb_d.gif";

function setExpandedIco(id) {
	var i=document.getElementById(id+'_swb_image');
	i.src='http://www.satdsl.cz/css_img/swb_fe.gif';
}

function setCollapsedIco(id) {
	var i=document.getElementById(id+'_swb_image');
	i.src='http://www.satdsl.cz/css_img/swb_fc.gif';
}

function toggleNode(id) {
	if(toggleLayer(id+'_swb_subitems')) setExpandedIco(id);
	else setCollapsedIco(id);
}
	
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;
	}
}