captcha.cellpadding {
   padding: 5;
}
captcha.norepeat {
   background-repeat: no-repeat;
   background-position: center;
}
captcha.norepeat A:link {
   background-repeat: no-repeat;
   background-position: center;
}
captcha.norepeat A:visited {
   background-repeat: no-repeat;
   background-position: center;
}
captcha.norepeat A:hover {
   background-repeat: no-repeat;
   background-position: center;
}
captcha.norepeat A:active {
   background-repeat: no-repeat;
   background-position: center;
}