Close a popup after postback

I have some aspx code(behind) evaluating a condition that, if true, should cause a child of the existing window to close. Javascript code as below would have been used to create the popup and I can call JS function that should close it.

>>
  top.open(theURL,'myWin','resizable=yes,width=760,height=470');
<<

The problem appears to be that the main window loses scope of the child because of a necessary postback. Is there a way to maintain a reference to the child so I can close it after the main postsback?

thx
--steve...
juststeveAsked:
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aki4uCommented:
did you tried to use html hidden field?
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juststeveAuthor Commented:
Nope...got a sample?
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aki4uCommented:
sorry about hidden field...you can use this (assuming that window is still open):

window.open('','myWin').close();
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juststeveAuthor Commented:
Thankx!
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