.top_left {
  background-image: url("../images/bg_top_left.gif");
  background-repeat: repeat-x;
}

.top_middle {
  background-image: url("../images/bg_top_middle.gif");
  background-repeat: repeat-x;
}

.top_right {
  background-image: url("../images/bg_top_right.gif");
  background-repeat: repeat-x;
}