function countUsersOnline(checked)
{
	var url = 'usersonlinecounter.php';
	// notice the use of a proxy to circumvent the Same Origin Policy.
	var a = new Ajax.PeriodicalUpdater('', url, {
	  
	  method: 'get',
	  frequency: 10,
	  requestHeaders: {Accept: 'application/json'},
	  onSuccess: function(transport) {
	    var notice = $('notice');
	    var json = transport.responseText.evalJSON(true);
	      notice.update('Users online: '+json.usersOnline+'    Time: '+json.time).setStyle({ background: '#FFF' });
	  },
	  onFailure: function(gg) {
	  	alert('failure');
	  }
	});
	if ( checked == false )
	{
		a = 0;
	}
}