function toggle(id){
	var el = document.getElementById(id);
	if(el && el.style && el.style.display){
		el.style.display = (el.style.display == 'none')?'block':'none';
	}
	return false;
}
function open_node(id){
	var el = document.getElementById(id);
	if(el && el.style && el.style.display){
		el.style.display = 'block';
	}
	return false;
}