var msg = new Array();
var i = 0;
msg[i++] = '. The Presidential Address will be in October 2010';
msg[i++] = '. . The programme for 2010/11 will be available later in the year';
msg[i++] = '. . . Please consider joining the Society if not already a member';
msg[i++] = 'Forthcoming Meetings . . .';
var dwell = 3000;
id = setInterval('writemsg()',dwell);
var c = 0;
function writemsg() {
  app = msg[c++];
  if (c == i) c = 0;
  document.msgbox.msg.value = app;
}