.zoom_base, .zoom_in, .zoom_out {
  padding-left: 18px;
  min-height: 16px;
  background-repeat: no-repeat
}
.zoom_base { background-image: url(zoom/base.png); }
.zoom_in { background-image: url(zoom/in.png); }
.zoom_out { background-image: url(zoom/out.png); }
