.clear { /* generic container (i.e. div) for floating buttons */
    overflow: hidden;
    width: 100%;
}
a.button, a.button:link, a.button:visited, a.button:active{
    background: transparent url('button_a.gif') no-repeat scroll top right;
    color: #444;
    display: block;
    float: left;
    font: normal 12px arial, sans-serif;
    height: 20px;
    margin-right: 6px;
    padding-right: 11px; /* sliding doors padding */
    text-decoration: none;
}
a.button span, a.button:link span, a.button:visited span, a.button:active span {
    background: transparent url('button_span.gif') no-repeat;
    display: block;
    line-height: 11px;
    padding: 5px 0 5px 11px;
}
a.button:hover {
    background-position: bottom right;
    color: #000;
    outline: none; /* hide dotted outline in Firefox */
}

a.button:hover span {
    background-position: bottom left;
    padding: 6px 0 4px 11px; /* push text down 1px */
}