CodingForums.com - Comparing attributes?

Code:

<?xml version="1.0" encoding="utf-8"?>

<root>

<page file="register.php">

<title>Register</title>

<username>Username:</username>

<password>Password:</password>

<password2>Retype Pass:</password2>

<email>Email:</email>

</page>



<page file="login.php">

<username>Example</username>

<password>Pass</password>

</page>

</root>

Code:

xmlhttp.open("GET","../xml/en/register.xml",false);

xmlhttp.send();

xmlDoc=xmlhttp.responseXML; 

document.getElementById("username").innerHTML = xmlDoc.getElementsByTagName("username")[0].childNodes[0].nodeValue;

What im wanting to do is create one XML file per language the "file" attribute would be used so that if i have a duplicate XML tag i would be able to select only the tags within say register.php

Im new to XML/JS but in a nutshell i want to:
Select/jump to a certain tag
Pull all the data from that tag only

I could use xmlDoc.getElementsByTagName("username")[0] (register.php) and xmlDoc.getElementsByTagName("username")[1] (login.php) but thats not very practical when adding/deleting pages later

Is this the proper way to do this or should i have a xml file for each page
(en_register.xml
en_login.xml
fr_register.xml
fr_login.xml etc...)

Sorry if i haven't explained this well