.oculto
{
    display:none;
}

a.btn_ajustable.fleft {float: left; margin-right: 15px;}
a.btn_ajustable.fright {float: right; margin-left: 15px;}
a.btn_ajustable {display: block; height: 33px; line-height: 33px; text-decoration: none; color: #6b6253; font-size: 14px; padding: 0px 15px; position: relative; background: url(../imagenes/bg_btns.png) no-repeat; font-weight: bold; font-family:CenturyGothic, Arial, helvetica;}
a.btn_ajustable span {display: block; height: 33px; width: 15px;  background: url(../imagenes/bg_btns.png) top right no-repeat; right: 0px; top: 0px; position: absolute;}
a.btn_ajustable:hover { background-position: 0px -33px; color: #fff; }
a.btn_ajustable:hover span { background-position: right -33px;}