How to access nested iframes?

[redsHirelehix]

I need to send post message (window.postmessage) to iframe.
currently its working if i have single iframe inside parent page.But I want to make it work for nested iframes.
Criterias are :

• I can just add listener code in last leaf iframe.
• Do not know length of iframe nesting.
• Need both way communication , from parent to child also by leaf iframe to parent.

I am sick of third part iframes , please suggest me some appropriate solution.