Some trouble with getElementById method

Hi
I have an XML file just like that:
<?xml version="1.0" encoding="UTF-8"?>
<persons id="root">
    <firstname1 id="firstname1">John</firstname1>
    <lastname1 id="lastname1">Brown</lastname1>
    <firstname2 id="firstname2">Andrew</firstname2>
    <lastname2 id="lastname2">Clark</lastname2>
    <firstname3 id="firstname3">Sylvie</firstname3>
    <lastname3 id="lastname3">Steevens</lastname3>
    <firstname4 id="lastname3"></firstname4>
    <lastname4 id="lastname4"></lastname4>
</persons>I enter this one into the Document by using the standard way, problem is with calling gsome etElementById method. When I put there any one id value, firstname1, or root for instance, then I get null.
What do I do wrong?
Regards
Krzysztof Malinowski

http://javaalmanac.com/egs/org.w3c.dom/GetById.html

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