1. bodyContent a.external,
  2. bodyContent a[href ^="gopher://"] {

background: url(/skins-1.5/monobook/external.png) rtl no-repeat right center !important;

       margin-left: 15%;
       margin-right: 15%; padding-left:48px; padding-right:10px; padding-top:10px;
       padding-bottom:10px

}