function na_restore_img_src(name, nsdoc)
	{
	  var img = eval((navigator.appName == 'Netscape') ? nsdoc+'.'+name : 'document.all.'+name);
	  if (name == '')
		return;
	  if (img && img.altsrc) {
		img.src    = img.altsrc;
		img.altsrc = null;
	  } 
	}

	function na_change_img_src(name, nsdoc, rpath, preload)
	{ 
	  var img = eval((navigator.appName == 'Netscape') ? nsdoc+'.'+name : 'document.all.'+name);
	  if (name == '')
		return;
	  if (img) {
		img.altsrc = img.src;
		img.src    = rpath;
	  } 
	}