var plus = new Image();
  plus.src = "/images/design/plus.gif";
var minus = new Image();
  minus.src = "/images/design/minus.gif";
var page = new Image();
  item.src = "/images/design/page.gif";

function node(obj){
  obj = obj.parentNode;
  obj.className = (obj.className == 'open') ? 'closed' : 'open';
  return false;
}