function toggleVisible(id, anchor) {
  var item = document.getElementById(id);
  if (item.style.display) {
	  item.style.display = '';
	  anchor.getElementsByTagName("u")[0].style.background = 'url(/images_inside/arrow_grey2.gif) no-repeat 5px 2px';
  }
  else {
	  item.style.display = 'none';
	  anchor.getElementsByTagName("u")[0].style.background = 'url(/images_inside/arrow_grey.gif) no-repeat 5px 2px';
  }
}