b.bt, b.bt b, b.bb, b.bb b {display: block; height: 10px;font-size: 1px;background:url(grey1px.gif) no-repeat;position:relative}

b.bt {top: -3px; left: -3px}

b.bt b {background-position:100% -10px; left: 6px}

b.bb {background-position:0 -20px; top:3px; left: -3px}

b.bb b {background-position:100% -30px; left: 6px}

.pb {padding-left: 10px; padding-right: 10px; }