.box_lo {
  background:url(layout/box_lo.png) top left no-repeat;
  width:18px;
  height:18px;
}

.box_o {
  background:url(layout/box_o.png) top repeat-x;
  height:18px;
}

.box_ro {
  background:url(layout/box_ro.png) top right no-repeat;
  width:18px;
  height:18px;
}

.box_l {
  background:url(layout/box_l.png) top left repeat-y;
  width:18px;
}

.box_r {
  background:url(layout/box_r.png) top right;
  width:18px;
}

.box_lu {
  background:url(layout/box_lu.png) bottom left no-repeat;
  width:18px;
  height:18px;
}

.box_u {
  background:url(layout/box_u.png) bottom;
  height:18px;
}

.box_ru {
  background:url(layout/box_ru.png) bottom right;
  width:18px;
  height:18px;
}

.box_l_empty {
  background:url(layout/box_orl.png) top left no-repeat;
  height:18px;
}

.box_r_empty {
  background:url(layout/box_orr.png) top right no-repeat;
  height:18px;
}