function generate_address( username, hostname, subject ) {

        var domain = ".com";

        var atsign = "@";

        var addr = username + atsign + hostname + domain;

        document.write( 

          "<" + "a" + " " + "href=" + "mail" + "to:" + addr + "?subject=" + subject + ">" +

          addr +

          "<\/a>");

      }