.thumb {
  max-width: 68;
  max-height: 300px;
  width: expression(this.width > 68 ? "68px" : true);
  height: expression(this.height > 300 ? "300px" : true);
}

.mainimage {
  max-width: 200;
  max-height: 300px;
  width: expression(this.width > 200 ? "200px" : true);
  height: expression(this.height > 300 ? "300px" : true);
}