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First off, what are you using to debug this on your own? I would recommend that you try Firefox along with Firebug (http://www.getfirebug.com/). This approach sure seems easier than waiting for somebody on a forum to debug your code.
The code 'document.getElementById("show")' seems a little odd. I would wonder if the code is bombing there after processing the first node.
snakes are really good at eating slugs. And you wouldn't think it, but so are tiny ads:
a bit of art, as a gift, that will fit in a stocking