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The JavaScript hierarchy may be illustrated as follows:
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top.frames[frameIndex].document.
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forms[formIndex].elementName.value
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where frameIndex and formIndex are usually numbers
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The frames array may also be indexed by name. For example, frames["frameName"] is sometimes more convenient
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One can use eval to generate framename
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window and Frame are objects reflecting hierarchy
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document, Form, history, Link, and location are objects defining parts of a window or frame
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anchors, links, forms, frames, applets, and images are property arrays
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top, parent, and self are properties of frames and windows
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All of the above are defined within a single browser window
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opener is a property of window, which contains the name of the window that called open to create the current window
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