function set_event (obj, event, handler) {
    
    if (obj.addEventListener) {
        obj.addEventListener(event, handler, true);
        return true;
    } else if (obj.attachEvent) {
        var r = obj.attachEvent('on' + event, handler);
        return r;
    } else {
        obj['on' + event] = handler;
    }
    
}

var obj = $(this.textareaID).contentWindow.document

set_event(obj, 'keypress', this.eventHandler);
set_event(obj, 'keydown', this.eventHandler);
set_event(obj, 'keyup', this.eventHandler);