Required library edition:
Required library file: dhtmlxcalendar.js

attaches any user-defined event handler to available events

• evName - name of the event;
• evHandler - user-defined event handler.

              calendar.attachEvent(evName, evHandler);

Several handlers can be attached to one and the same event, and all of them will be executed.

Note: the names of the events are case-insensitive.