Javascript: Adding attribute dynamically to the tag

I'm trying to add FB xmlns attribute to the document's `` tag (``) dynamically. For some reason adding it like below does not work: htmltag = document.getElementsByTagName ('html'); htmltag[0].setAttribute("xmlns:fb","");"); How can I do it? Thanks! Update: No jquery or other lib is available.
Who should read that attribute? XML parsers don’t interpret JavaScript.

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