ROLLOVER_SPEC a {
    /* Image */
    display: block;
    background: transparent url("IMG_URL") 0 0 no-repeat;
    overflow: hidden;
    width: IMG_WIDTHpx;
    /* Text placement and size, etc */
    CENTER_OR_PAD;
    padding-top: PADDING_TOPpx;
    font-size: FONT_SIZEpx;
    padding-bottom: PADDING_BOTTOMpx;
    text-decoration: none;
    white-space: nowrap;
    border: none;
    margin: 0;
}
ROLLOVER_SPEC a:hover {
    background-position: 0 -IMG_HEIGHT_2px;
}
ROLLOVER_SPEC li {
    display: inline;
    padding: 0;
    margin: 0;
    HOR_OR_VER;
}