function getGallery() {
  gallery = null;
  queryString = document.location.search.substring(1);
  parms = queryString.split('&');
  
  for (i = 0; i < parms.length; i++) {
    pos = parms[i].indexOf('=');
	
    if (pos > 0) {
      key = parms[i].substring(0, pos);
      val = parms[i].substring(pos + 1);
	  
	  if (key == 'gallery') {
		gallery = val;
	  }
    }
  }
    
  return gallery;
}

function getImageNumber() {
  imageNumber = null;
  queryString = document.location.search.substring(1);
  parms = queryString.split('&');
  
  for (i = 0; i < parms.length; i++) {
    pos = parms[i].indexOf('=');
	
    if (pos > 0) {
      key = parms[i].substring(0, pos);
      val = parms[i].substring(pos + 1);
	  
	  if (key == 'imageNumber') {
		imageNumber = val;
	  }
    }
  }
  
  return imageNumber;
}