How to determine the relative position of an element?

D

delerious

I know how to figure out the top coordinate of an element relative to the top
of the document. I can use one of the following:

- document.defaultView.getComputedStyle(document.getElementById(element_id),
'').getPropertyValue('top')

- document.getElementById(element_id).offsetTop

But I don't know how to determine the top coordinate of an element relative to
the top of the viewable area of the browser. Does anyone know how to do this
(in IE, Opera, and Mozilla)?
 

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