Js Serialize Form

function serializeForm(form)
{
    var elems = form[0].elements;
    var serialized = [], i, len = elems.length, str = "";
    
    for (i = 0; i < len; i += 1)
    {
        var element = elems[i];
        var type = element.type;
        var name = element.name;
        var value = element.value;
        
        switch (type)
        {
            case "radio":
            case "checkbox":
                if (!element.checked)
                {
                    break;
                }
            case "hidden":
            case "text":
            case "textarea":
            case "select-one":
                str = name + "=" + value;
                if (name.toString() != "")
                {
                    serialized.push(str);
                }
                break;
                
            default:
                break;
        }
    }
    
    return serialized.join("&");
}