function showHideMenuNode(node_id, image_id){
	n = document.getElementById(node_id);
	i = document.getElementById(image_id);
	if(n){
		//n.className='clearfix';
		n.style.display = n.style.display == "none" ? "block" : "none";
		if(i){
			i.src = n.style.display == "none" ? "images/plus-green.gif" : "images/minus-green.gif";
		}
	}
}