checks whether an event has some handler(s) specified
| name | SchedulerEventName | the event's name | 
| boolean | returns true, if some handler is specified for the event | 
scheduler.attachEvent("onEventSave",function(id,data){
    if (data.text.length<20) {
        alert("Text too small");
        return false;
    }
    return true;
})
...        
scheduler.checkEvent("onEventSave"); //returns 'true'