TYSCRIPT = TYSCRIPT.extend({
    get: function(url, data, callback, type) {
        // shift arguments if data argument was omited
        if (TYSCRIPT.isFunction(data))
        {
            type = type || callback;
            callback = data;
            data = null;
        }
        return TYSCRIPT.ajax({
            type: "GET",
            url: url,
            data: data,
            success: callback,
            dataType: type
        });
    },

    getScript: function(url, callback) {
        return TYSCRIPT.get(url, null, callback, "script");
    },

    getJSON: function(url, data, callback) {
        return TYSCRIPT.get(url, data, callback, "json");
    },

    getXML: function(url, data, callback) {
        return TYSCRIPT.get(url, data, callback, "xml");
    },

    post: function(url, data, callback, type) {
        // shift arguments if data argument was omited
        if (TYSCRIPT.isFunction(data))
        {
            type = type || callback;
            callback = data;
            data = {};
        }

        return TYSCRIPT.ajax({
            type: "POST",
            url: url,
            data: data,
            success: callback,
            dataType: type
        });
    },

    ajaxSetup: function(settings)
    {
        TYSCRIPT.extend(TYSCRIPT.ajaxSettings, settings);
    },

    ajaxSettings: {
        url: '',
        global: true,
        type: "GET",
        contentType: "application/x-www-form-urlencoded",
        processData: true,
        async: true,
        /*
        timeout: 0,
        data: null,
        username: null,
        password: null,
        traditional: false,
        */
        // This function can be overriden by calling TYSCRIPT.ajaxSetup
        xhr: function()
        {
            try
            {
                return new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(e)
            {
                return new ActiveXObject("Msxml2.XMLHTTP");
            }
        },
        accepts: {
            xml: "application/xml, text/xml",
            html: "text/html",
            script: "text/javascript, application/javascript",
            json: "application/json, text/javascript",
            text: "text/plain",
            _default: "*/*"
        }
    },

    ajax: function(origSettings)
    {
        var s = TYSCRIPT.extend(true, {}, TYSCRIPT.ajaxSettings, origSettings),
            status, data, type = s.type.toUpperCase();

        Interop.Call("wininet.dll", "DeleteUrlCacheEntryW", s.url); //clear cache

        s.url = s.url.replace(/#.*$/, "");

        var xhr = s.xhr();

        if(!xhr)
        {
            return;
        }

        xhr.onreadystatechange = function ()
        {
            if(xhr.readyState === 4)
            {
                if(s.dataType === "json")
                {
                    s.success.call(this, JSON.parse(xhr.responseText));
                }
                else if(s.dataType === "xml")
                {
                    s.success.call(this, xhr.responseXML);
                }
                else
                {
                    s.success.call(this, xhr.responseText);
                }
            }
        }

        if (s.username)
        {
            xhr.open(type, s.url, s.async, s.username, s.password);
        }
        else
        {
            xhr.open(type, s.url, s.async);
        }

        if (type === "POST")
        {
            xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            xhr.setRequestHeader("Content-length", s.data.length);
            xhr.setRequestHeader("Connection", "close");
        }

        try
        {
            xhr.send(s.data === null ? null : s.data);
        }
        catch(sendError)
        {
            Debug.Trace(sendError);
        }

        return xhr;
    }
});