How to recognize the 'last' window?

[Martin Senger <M.Senger@dkfz-heidelberg.de>]

Does anybody know how to check if I am in the topmost window?

The idea behind is:
   I have a 'close' button in my document with _self.close() function.
   But I do not want to call this function in case when I am in the last
   browser window.   It would exit the whole Navigator and that I is not
   what I want. So something like that would suit me:
   function closeConditionally() {
       if (there-are-more-open-windows) _self.close()
       else return;

Thanks for answers
Martin

-- 
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| Martin Senger     m.senger@dkfz-heidelberg.de      |
|                   voice: (0049) 6221/422340        |
|                   fax:   (0049) 6221/422333        |
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