function toQueryComponent(input) {
    if (!input.name || input.disabled)
        return "";

    var n = urlencode(input.name);

    switch (input.type) {
    case "text":
    case "password":
    case "submit":
    case "hidden":
        return n + "=" + urlencode(input.value);
    case "textarea":
        // normalize line breaks as CR LF pairs as per RFC 1866 
        //var v = input.value.split(/\r\n|\r|\n/).join("\r\n");
		var v = input.value.replace(/(\r\n)|\r|\n/g, "\r\n");
        return n + "=" + urlencode(v);
    case "checkbox":
    case "radio":
        if (!input.checked)
            return "";
        var v = getRealValue(input);
        if (v === null) v = "on";
        return n + "=" + urlencode(v);
    case "select-one":
    case "select-multiple":
        var nvp = [];
        var opt, i = 0;
        while ((opt = input.options[i++]) != null) {
            if (opt.selected) {
                var v = getRealValue(opt);
                if (v === null) v = opt.text;
                // older versions of IE do not support Array.push 
                nvp[nvp.length] = n + "=" + urlencode(v);
            }
        }
        return nvp.join("&");
    default:
        // input types reset, button, image, and file not implemented 
        return "";
    }
}

function urlencode(str) {
    var v;
    try { v = encodeURIComponent(str); } catch (e) { v = escape(str); }
    return v.replace(/%20/g,"+");
}

function getRealValue(input) {
    var attr = input.getAttributeNode("value");
    return (attr) ? input.getAttribute("value") : null;
    //return (attr && attr.specified) ? input.getAttribute("value") : null;
}

function buildQueryString(form) {
    var str = "";
    var element, i = 0;
    while ((element = form.elements[i++]) != null) {
        var qc = toQueryComponent(element);
        if (qc != "") str += "&" + qc;
    }
    return str.substring(1);
}