if (document.getElementById){ 
  document.write('<style type="text/css">.menuitemgroup{display: none;}</style>')
}


function SwitchMenu(obj, thePath)
{
var open = 'url("'+thePath + 'images/chapter_open.gif")';
var close = 'url("'+thePath + 'images/chapter.gif")';
  if(document.getElementById)  {
    var el = document.getElementById(obj);
    var title = document.getElementById(obj+'Title');

    if(el.style.display != "block"){ 
      title.style.backgroundImage = open;
      el.style.display = "block";
    }else{
      title.style.backgroundImage = close;
      el.style.display = "none";
    }
  }
}