.iconize {
   display: inline-block;
   width: 12px;
   padding: 0px 2px;
   background-repeat: no-repeat;
   background-position: left center;
   cursor: pointer;
}

.icon-plus {
   background-image: url(../images/plus_alt-16.png);
}
.icon-minus {
   background-image: url(../images/minus_alt-16.png);
}