TOPIC: getEventById() where is this function defined

In customtemplates.html,inside function editMyEvent(eventId) there is function call getEventById(eventId); i wanted to know where is this js function defined can\'t able to locate.

getEventById( ) is a part of Web2Cal\'s Core function. By invoking ical.getEventById (eventID), Web2Cal will return the cached version of the event object you provided on load.

Thanks