new Ajax.PeriodicalUpdater('updtime', '/welcome/track_time?sess=72150086223274863334718480505157', {
  method: 'get', frequency: 5, decay: 1
});
function trackclick() {
	new Ajax.Request('/welcome/track_click?sess=72150086223274863334718480505157', {
	  onSuccess: function(transport) {
	    // success
	  }
	});
	
}