function toggleVisible(id, img) {
  var item = document.getElementById(id);
  var showImg = document.getElementById(img);
  
  if (item.style.display) {
	  
	  item.style.display = '';
	  showImg.src= "images/arrow_grey2.gif";
  }
  else {
	 
	  item.style.display = 'none';
	  showImg.src = "images/arrow_grey.gif";
  }
}