You don't even need Javascript. <a class="digg" href="http://digg.com/submit/">...digg button code...</a> Now you can use CSS to hide visited links.

You don't even need Javascript. <a class="digg" href="http://digg.com/submit/">...digg button code...</a> Now you can use CSS to hide visited links. a.digg:visited { display: none; }