How to access frames in parent layer?

programming flash
1

Hi,

Since I am new here in Kirupa and in an FlashCS3, I would like to say hi first before I start with my problem

I was trying to figure it by myself - no luck at all… So I hope someone here will be able to help me out. Well, I am working in Flash CS3 with AS3 and I am trying to access a movie through buttons that are placed in lower layer. I am getting the following error:
TypeError: Error #1010: A term is undefined and has no properties.
at mytry_fla::pageGroup_22/onJackClick()

my code for this button is:
[FONT=Courier New][/FONT]

 
jack_btn.addEventListener(MouseEvent.CLICK,onJackClick);

function onJackClick(e:MouseEvent):void
{
   this.content_mc.gotoAndPlay("jack");
}

Please, help!