function getFormData(form) {
    var dataString = "";

    function addParam(name, value) {
        dataString += (dataString.length > 0 ? "&" : "")
                + escape(name).replace(/\+/g, "%2B") + "="
                + escape(value ? value : "").replace(/\+/g, "%2B");
    }

    var elemArray = form.elements;
    for (var i = 0; i < elemArray.length; i++) {
        var element = elemArray[i];
        var elemType = element.type.toUpperCase();
        var elemName = element.name;
        if (elemName) {
            if (elemType == "TEXT"
                    || elemType == "TEXTAREA"
                    || elemType == "PASSWORD"
                    || elemType == "HIDDEN")
                addParam(elemName, element.value);
            else if (elemType == "CHECKBOX" && element.checked)
                addParam(elemName, element.value ? element.value : "On");
            else if (elemType == "RADIO" && element.checked)
                    addParam(elemName, element.value);
                else if (elemType.indexOf("SELECT") != -1)
                        for (var j = 0; j < element.options.length; j++) {
                            var option = element.options[j];
                            if (option.selected)
                                addParam(elemName,
                                        option.value ? option.value : option.text);
                        }
        }
    }
    return dataString;
}