From: FAQ server on
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FAQ Topic - Why do I get permission denied when accessing a
frame/window?
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In the normal browser security model, a script may only access the
properties of documents served from the same domain or IP address,
protocol, and port.

Any attempt to access a property in such cases will result in a "Permission
Denied" error. Signed scripts or trusted ActiveX objects can
overcome this in limited situations.

http://msdn.microsoft.com/en-us/library/ms533028%28VS.85%29.aspx

https://developer.mozilla.org/En/Same_origin_policy_for_JavaScript


The complete comp.lang.javascript FAQ is at
http://jibbering.com/faq/

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