function valueToString(v)
{
    var res = "";

    if (v === undefined) {
        res = "undefined";
    } else if (v === null) {
        res = "null";
    } else if (v.constructor === Array) {
        var a = [];
        for (var i=0; i<v.length; i++) {
            a.push(valueToString(v[i]));
        }
        res = "[ " + a.join(", ") + " ]";

    } else if (typeof v === "string" || v.constructor === String) {
        v = v.replace("\\", "\\\\").replace('"', '\\"').replace("\n", "\\n");
        res = '"' + v + '"';
    } else if (typeof v === "object") {
        res = "Object";
    } else {
        res = v.toString();
    }

    return res;
}