Nested movieClip and attachMovie

Hi

I’ve created an empty movie clip at the root level called ‘folio’, to which I’ve attached a movieClip, ‘press_1_large’, using attachMovie.

Nested within this movieClip is another called ‘close_btn’, with an instance name of ‘close_btn’. Both have their linkage set to export for ActionScript.

I need to attach an onRelease function to this nested movieClip. Can anybody tell me how to access it? I’ve tried:

_root.folio.press_1_large.close_btn.onRelease = function () {
function here
}

without success.

Any help would be appreciated - I’ve been stuck on this for two days!

Thanks