Alt!! Ho beccato un punto e virgola di troppo che ti genera variabili globali!! Usa questa versione corretta:

codice:
function buildValue(sValue) {
	if (/^\s*$/.test(sValue)) { return(null); }
	if (/^(true|false)$/i.test(sValue)) { return(sValue.toLowerCase() === "true"); }
	if (isFinite(sValue)) { return(parseFloat(sValue)); }
	if (isFinite(Date.parse(sValue))) { return(new Date(sValue)); }
	return(sValue);
}

function getXMLData (oXMLParent) {
	var vResult = /* true is the default value for empty nodes */ true, nLength = 0, sTxtContent = "";
	if (oXMLParent.hasAttributes()) {
		vResult = {};
		for (nLength; nLength < oXMLParent.attributes.length; nLength++) {
			iAttrib = oXMLParent.attributes.item(nLength);
			vResult["@" + iAttrib.nodeName.toLowerCase()] = buildValue(iAttrib.nodeValue.replace(/^\s+|\s+$/g, ""));
		}
	}
	if (oXMLParent.hasChildNodes()) {
		var iKey, iValue, iXMLChild;
		for (var iChildId = 0; iChildId < oXMLParent.childNodes.length; iChildId++) {
			iXMLChild = oXMLParent.childNodes.item(iChildId);
			if (iXMLChild.nodeType === 1 && !iXMLChild.prefix) {
				if (nLength === 0) { vResult = {}; }
				iKey = iXMLChild.nodeName.toLowerCase();
				iValue = getXMLData(iXMLChild);
				if (vResult.hasOwnProperty(iKey)) {
					if (vResult[iKey].constructor !== Array) { vResult[iKey] = [vResult[iKey]]; }
					vResult[iKey].push(iValue);
				} else { vResult[iKey] = iValue; nLength++; }
			} else if (iXMLChild.nodeType === 3) { sTxtContent += iXMLChild.nodeValue.replace(/^\s+|\s+$/g, ""); }
			else if (iXMLChild.nodeType === 4) { sTxtContent += iXMLChild.nodeValue; }
		}
	}
	if (nLength > 0) { vResult.keyValue = buildValue(sTxtContent); Object.freeze(vResult); }
	else if (sTxtContent) { vResult = buildValue(sTxtContent); }

	return(vResult);
}