function xajax_extend()

{

    if(typeof(xajax) == 'undefined')

    {

        return false;

    }

   

    xajax.isIE = (document.all && navigator.appVersion.toLowerCase().indexOf('msie')!=-1) || false;

 

    xajax.newSessionID = function()

    {

        var sessionID;

        sessionID = new String(new Date().getTime());

        var random = new String(Math.random( )).substr(2);

        sessionID = sessionID + random;

        return sessionID;

    };

   

    // overlay this if you need to

    xajax.setStatusMessages = function(msg)

    {

        window.status = msg;

    };

   

    // overlay this if you need to

    xajax.setCursor = function(cursor)

    {

          if (document.body)

            document.body.style.cursor = cursor;

    };

   

    var loadingTimeout;

    // overlay this if you need to

       xajax.beforeUpload = function()

       {

        // init status

        if(xajaxWaitCursor) xajax.setCursor('wait');

           if(xajaxStatusMessages) xajax.setStatusMessages('Sending Request...');

        clearTimeout(loadingTimeout);

        loadingTimeout = setTimeout("xajax.loadingFunction();",400);

        if (xajaxDebug) xajax.DebugMessage("Starting xajax...");

       };

 

    xajax.upload = function(rpcFunc,formID,url)

    {

        var form = xajax.$(formID);

        if(!form)

        {

            return false;

        }

        if(form.encoding.toLowerCase() != 'multipart/form-data')

        {

            form.encoding = 'multipart/form-data';

        }

        if(form.method.toLowerCase() != 'post')

        {

            form.method = 'post';

        }

        var newSessionID = xajax.newSessionID();

       

        xajax.beforeUpload();

 

        if(!url)

        {

            url = xajaxRequestUri;

        }

        var separator = '?';

        if(url.indexOf('?') != -1)separator = '&';

        url += separator + 'xajax='+encodeURIComponent(rpcFunc);

        url += "&xajaxr=" + new Date().getTime();

        // get the upload file local path

        var formItem;

        var nodeName;

        for(var i=0; i<form.getElementsByTagName('input').length; i++)

        {

            formItem = form.elements[i];

            nodeName = new String(formItem.nodeName).toLowerCase();

            if(formItem.name == '' || nodeName == 'button')

            {

                continue;

            }

            if(formItem.type == 'file')

            {

                url += '&'+formItem.name+'='+encodeURIComponent(formItem.value);

            }

        }

        form.action = url;

       

        var iframeName = form.id + newSessionID;

        var iframe;

        if((iframe = xajax.$(iframeName)))

        {

            document.body.removeChild(iframe);

        }

        iframe = xajax.createIframe(iframeName,iframeName);

        form.target = iframeName;

        var xmlDoc;

        var responseXML;

        if(typeof iframe.onreadystatechange == 'object') // for IE

        {

            iframe.onreadystatechange = function()

            {

                if(iframe.readyState == 'complete' && !iframe.loaded)

                {

                    // IE load twice (bug or feature?)

                    iframe.loaded = true;

                    xmlDoc = document.frames(iframe.id);

                    if(xmlDoc.window.document.location != iframe.src)

                    {

                        responseXML = xmlDoc.window.document.XMLDocument;

                        xajax.uploadResponse(responseXML,iframe, xmlDoc);

                    }

                }

            }

        }

        else // for FF

        {

            iframe.onload = function()

            {

                xmlDoc = iframe.contentWindow;

                if(xmlDoc.window.document.location != iframe.src)

                {

                    responseXML = xmlDoc.document;

                    xajax.uploadResponse(responseXML,iframe, xmlDoc);

                }

            }

        }

    };

   

    xajax.uploadResponse = function(responseXML,iframeObj, xmlDoc)

    {

        // response the xml

        var error=false;

        if(responseXML)

        {

            try

            {

                xajax.processResponse(responseXML);

            }

            catch(e)

            {

                error = true;

                //xajax.DebugMessage(e.description);

            }

        }

        else

        {

            error = true;

        }

       

        if(error)

        {

            var responseText = new String(xmlDoc.document.body.innerHTML);

            xajax.uploadFalse(responseText);

        }

        else

        {

            xajax.uploadSuccess();

        }

 

        // remove the iframe after response

        setTimeout(function(){document.body.removeChild(iframeObj)}, 500);

    };

   

    // overlay this if you need to

    xajax.uploadFalse = function(responseText)

    {

        var errorString = "Error: the XML response that was returned from the server is invalid.";

        errorString += "\nReceived:\n" + responseText;

        var trimmedResponseText = responseText.replace( /^\s+/g, "" );// strip leading space

        trimmedResponseText = trimmedResponseText.replace( /\s+$/g, "" );// strip trailing

        if (trimmedResponseText != responseText)

            errorString += "\nYou have whitespace in your response.";

        xajax.DebugMessage(errorString);

        xajax.setCursor('default');

        if (xajaxStatusMessages == true) xajax.setStatusMessages('Invalid XML response error');

    };

   

    // overlay this if you need to

    xajax.uploadSuccess = function()

    {

        xajax.setCursor('default');

    };

   

    xajax.createIframe = function(name,id)

    {

        var iframe;

        if(!id)

        {

            id = '';

        }

        if(xajax.isIE) // for IE

        {

            iframe = document.createElement('<iframe id="'+id+'" name="'+name+'">');

        }

        else // for FF

        {

            iframe = document.createElement('iframe');

            iframe.id = id;

            iframe.name = name;

        }

        iframe.width = '0';

        iframe.height = '0';

        iframe.style.display = 'none';

        iframe.scrolling = 'no';

        iframe.src = 'about:blank';

        document.body.appendChild(iframe);

        return iframe;

    };

    return true;

}

xajax_extend();