new Ajax.PeriodicalUpdater('current_sig', '/status/mg/current_sig.inc', { method: 'get', frequency: 1,	decay: 4 });
//new Ajax.Updater('current_sig','/status/mg/current_sig.inc',{method: 'get'});
// I would like to have the pulldown menu be preselected with the current signal.
//var form = $('mg_signal');
//var input = form['signal'];
//$F(input);
//new Ajax.PeriodicalUpdater('$input', '/status/mg/cur_pd.inc', { method: 'get', frequency: 1,	decay: 4 });