detect flash player version of published SWF

Hi I have a swf file (let say child.swf).

Once It loaded I want to know parent swf was published on flash player 9 or flash player 10. How to find that?

Question:

1)parent.swf loades child.swf

2)after child.swf loaded --> need to check parent.swf is published on flash player 9 or 10.

3)if parent.swf published on flash player 9 then child.swf will run a function

4)if parent.swf published on flash player 10 then child.swf will run some other function.

On the above for the based on the 2nd point question 3 or 4 will happen.

On the above case I have only one parent... In some other case I may have multiple parents. My question to how to detect top most player's published version?

Note:

1. Capabilities.version returns current flash player version which is installed on browser (it is not help my question)
2. The following link has infomation about As version used on the swf (it is not help my qeuestion)

Detect ActionScript and Flash player version of Published SWF

Thanks,

Siva