form div {
  overflow: hidden;
  margin: 0 0 5px 0;
}
.button {
  margin: 13px 0 0 5px;
  text-indent: -9999px;
  cursor: pointer;
  width: 20px;
  height: 21px;
  float: left;
  text-align: center;
  background: url(../images/buttons.png) no-repeat;
}

.button:hover {
	background: url(../images/buttons_hover.png) no-repeat;
}

.dec {
  background-position: 0 -20px;
}

.dec:hover {
	background-position: 0 -20px;
}