.cas
{       border: medium none;
        cursor:pointer;
        font-family: 'helvetica',arial,sans-serif;
        margin-left:20px;
        text-transform: uppercase;
}
.cas a
{       background: url("../images/black-btn-off.jpg") repeat-x scroll 0 0 transparent;
        color: #FFFFFF;
        cursor:pointer;
        padding: 6px 16px;
        width:130px;
        text-decoration:none;
}
.cas a:hover
{       background: url("../images/black-btn-on.jpg") repeat-x scroll 0 0 transparent;
}