function hideShowIcon(noneblock) {
	document.getElementById(imageName).style.display = noneblock;
	}

<!--
/* pop-up window centrer script */
   var screenwidth = window.screen.width;
   var screenheight = window.screen.height;
function enlarge(enlargeImageName,extension)
 {
   LargeImage = new Image();
   LargeImageURL = "/images/" + enlargeImageName + "." + extension;
   LargeImage.src = LargeImageURL;
   var NewWindow;
 if (LargeImage.width) {
   var popupwidth = LargeImage.width + 20;
   var popupheight = LargeImage.height + 70;
 } else {
   var popupwidth = 300;
   var popupheight = 500;
 }
   var popwinx = (screenwidth - popupwidth) / 2;
   var popwiny = (screenheight - popupheight - 50) / 2;

  NewWindow = window.open(LargeImageURL,enlargeImageName,'Left='+popwinx+',Top='+popwiny+',width='+popupwidth+',height='+popupheight+',address=1,toolbar=0,resizable=1,status=0,scrollbars=0,locationbar=0,directories=0,menubar=0,history=1');
  NewWindow.resizeTo(popupwidth, popupheight);
  if (window.focus) {NewWindow.focus()}
}