//const BROWSER_STATUS_OK = 0;                // When running locally
const BROWSER_STATUS_OK = 200;              // Header status code, request received OK
const BROWSER_STATUS_NOTMODIFIED = 304;     // Page has been cached


class Ajax
{
    // Get an XMLHttpRequest object so we can peform AJAX requests.
    static GetRequest(): XMLHttpRequest
    {
        if (typeof XMLHttpRequest != undefined)
        {
            // This is the standard class supported by all browsers
            // including IE7
            return new XMLHttpRequest();
        }
        else if ("ActiveXObject" in window)
        {
            var version = new Array("MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.3.0");
            for (var i = 0; i < version.length; i++)
            {
                try
                {
                    return new ActiveXObject(version[i]);
                }
                catch (Error)
                {
                }
            }
        }
        throw new Error("XMLHttp object could not be created");
    }
}