function select(src, elem)
{
  jQuery('.neg_img').css('filter','gray');
  obj = document.getElementById('big_image');
  elem.style.filter = ' ';
  obj.src = src + '&original';
}

function unselect(src)
{
  obj = document.getElementById('big_image');
  obj.src = '?node_id=' + src + '&original';
  obj.style.filter = 'none';
}