for (var i=1; i < 12; i++) {
  eval('sculpture' + i + '_1 = new Image(80,80)');
  eval('sculpture' + i + '_1.src = "images/thumbs/sculpture' + i + '_1.jpg"');
  eval('sculpture' + i + '_2 = new Image(80,80)');
  eval('sculpture' + i + '_2.src = "images/thumbs/sculpture' + i + '_2.jpg"');
}