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From: FAQ server on 17 Jun 2010 19:00
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FAQ Topic - How do I access a frame's content?
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To reference another frame on the _same domain_:

The content window of a ` FRAME ` or ` IFRAME ` can be
accessed by the ` frames ` collection.

Example:

var fwin;
fwin = self.frames[0]; // or:
fwin = self.frames["iframeName"];

or, from the ` IFRAME ` or ` FRAME ` element:

var iframeEl = document.getElementById("myFrame");
var fwin = iframeEl.contentWindow; // Nonstandard, but widely supported.
var fdoc = iframeEl.contentDocument; // DOM2 HTML Standard.

A global identifier ` moomin ` in the the iframe's content window
is accessed as ` fwin.moomin `.

To communicate between frames on _different_ domains:

Where supported, (IE8, Firefox 3, Opera 9, Safari 4), use
` window.postMessage( message[, port], otherDomain); `.

Example:

http://jibbering.com/faq/example/postMessage.html

Where ` window.postMessage ` is not supported, the ` window.name ` property
can be set on the other window, which can poll for updates to that
property using ` setInterval(checkWinName, 100); ` where ` checkWinName `
is a function that polls to check the value of
` self.name `.

http://en.wikipedia.org/wiki/Same_origin_policy

http://www-archive.mozilla.org/docs/dom/domref/dom_frame_ref5.html

https://developer.mozilla.org/en/DOM/window.postMessage

http://msdn.microsoft.com/en-us/library/cc197015(VS.85).aspx


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

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