.tri div {
  padding-left: 12;
  margin-bottom: 3;
}
.tri div div div {
  padding-left: 12;
  margin-bottom: 3;

}
.tri div#lin {
  background: url('/pic/li.gif') no-repeat;
}
.tri div#lip {
  background: url('/pic/plus.gif') no-repeat;
}
.tri div#lim {
  background: url('/pic/minus.gif') no-repeat;
}
.tri div#lin, .tri div#lip, .tri div#lim {
  background-position: 0 4;
}