span.ext {
  background: url(extlink.png) right center no-repeat;
  padding-right: 12px;
  zoom: 1;
}
span.mailto {
  background: url(http://www.thezeitgeistmovementuk.com/sites/all/modules/extlink/mailto.png) right center no-repeat;
  padding-right: 12px;
  zoom: 1;
}