How to serialize XML in javascript

Very surprised that I couldn't find anything on the Net for this that was straight forward and simple.

Here is how I convert any javascript object to XML. I use it to send data from javascript to web services.

function toXml(obj, name) {
    var s = "<" + name + ">";
    if (typeof (obj) == "object" || typeof (obj) == "array") {
        for (var property in obj) {
            var pName = property;
            if (!isNaN(pName)) pName = name + pName;
            s += toXml(obj[property], pName);
        }
    }
    else {
        s += obj.toString()
     .replace(/\&/g, '&amp;')
     .replace(/</g, '&lt;')
     .replace(/>/g, '&gt;')
     .replace(/\'/g, '&apos;')
     .replace(/\"/g, '&quot;');
    }
    s += "</" + name + ">";
    return s;
}