Add New Node in XML using javascript ActiveXObject give error

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I have a airport-codes.xml file :- \[code\]<?xml version="1.0" encoding="utf-8" ?><iata> <iata_airport_codes> <airport>Ocho Rios, Jamaica</airport> <code>OCJ</code> </iata_airport_codes></iata>\[/code\]I want to add node by using javascript i use this code to add node \[code\]var xml = new ActiveXObject("Microsoft.XMLHTTP");xml.open("GET", "airport-codes.xml", true);xml.send(null);var iata_airport_codes = xml.responseXML.createElement("iata_airport_codes");var airport = xml.responseXML.createElement("airport");airport.appendChild(xml.responseXML.createTextNode("Mr Njoroge"));var code = xml.responseXML.createElement("code");code.appendChild(xml.responseXML.createTextNode("21454741"));iata_airport_codes.appendChild(airport);iata_airport_codes.appendChild(code);xml.responseXML.appendChild(iata_airport_codes);\[/code\]but i got this error :- Only one top level element is allowed in an XML document.