Get parent frame id

[sunil philip]

How do i get the id of parent frame ie. "page1frame 2" from page2.aspx?
I have a javascript function in page2.aspx.I need to get the id without
passing 'this'.

page1.aspx
-------
<Frameset id ="page1frame 1" >
<frame id = "page1frame 2" src = page2.aspx>

page2.aspx
-------
<IFrame id ="page2frame 1" >
<frame id = "page2frame 2" src = page3.html>


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sunil philip,
S/W Engineer