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jQuery.extend({

    createUploadIframe: function(id, uri)

        {

                        //create frame

            var frameId = 'jUploadFrame' + id;

            if(window.ActiveXObject) {

                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');

                if(typeof uri== 'boolean'){

                    io.src = 'javascript:false';

                }

                else if(typeof uri== 'string'){

                    io.src = uri;

                }

            }

            else {

                var io = document.createElement('iframe');

                io.id = frameId;

                io.name = frameId;

            }

            io.style.position = 'absolute';

            io.style.top = '-1000px';

            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io                        

    },

    createUploadForm: function(id, fileElementId)

        {

                //create form        

                var formId = 'jUploadForm' + id;

                var fileId = 'jUploadFile' + id;

                var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');        

                var oldElement = $('#' + fileElementId);

                var newElement = $(oldElement).clone();

                $(oldElement).attr('id', fileId);

                $(oldElement).before(newElement);

                $(oldElement).appendTo(form);

                //set attributes

                $(form).css('position', 'absolute');

                $(form).css('top', '-1200px');

                $(form).css('left', '-1200px');

                $(form).appendTo('body');                

                return form;

    },

    ajaxFileUpload: function(s) {

        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout                

        s = jQuery.extend({}, jQuery.ajaxSettings, s);

        var id = new Date().getTime()        

                var form = jQuery.createUploadForm(id, s.fileElementId);

                var io = jQuery.createUploadIframe(id, s.secureuri);

                var frameId = 'jUploadFrame' + id;

                var formId = 'jUploadForm' + id;                

        // Watch for a new set of requests

        if ( s.global && ! jQuery.active++ )

                {

                        jQuery.event.trigger( "ajaxStart" );

                }            

        var requestDone = false;

        // Create the request object

        var xml = {}   

        if ( s.global )

            jQuery.event.trigger("ajaxSend", [xml, s]);

        // Wait for a response to come back

        var uploadCallback = function(isTimeout)

                {                        

                        var io = document.getElementById(frameId);

            try 

                        {                                

                                if(io.contentWindow)

                                {

                                         xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;

                         xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;

                                }else if(io.contentDocument)

                                {

                                         xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;

                        xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;

                                }                                                

            }catch(e)

                        {

                                jQuery.handleError(s, xml, null, e);

                        }

            if ( xml || isTimeout == "timeout") 

                        {                                

                requestDone = true;

                var status;

                try {

                    status = isTimeout != "timeout" ? "success" : "error";

                    // Make sure that the request was successful or notmodified

                    if ( status != "error" )

                                        {

                        // process the data (runs the xml through httpData regardless of callback)

                        var data = jQuery.uploadHttpData( xml, s.dataType );    

                        // If a local callback was specified, fire it and pass it the data

                        if ( s.success )

                            s.success( data, status );

                        // Fire the global callback

                        if( s.global )

                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );

                    } else

                        jQuery.handleError(s, xml, status);

                } catch(e) 

                                {

                    status = "error";

                    jQuery.handleError(s, xml, status, e);

                }

                // The request was completed

                if( s.global )

                    jQuery.event.trigger( "ajaxComplete", [xml, s] );

                // Handle the global AJAX counter

                if ( s.global && ! --jQuery.active )

                    jQuery.event.trigger( "ajaxStop" );

                // Process result

                if ( s.complete )

                    s.complete(xml, status);

                jQuery(io).unbind()

                setTimeout(function()

                                                                        {        try 

                                                                                {

                                                                                        $(io).remove();

                                                                                        $(form).remove();        

                                                                                } catch(e) 

                                                                                {

                                                                                        jQuery.handleError(s, xml, null, e);

                                                                                }                                                                        

                                                                        }, 100)

                xml = null

            }

        }

        // Timeout checker

        if ( s.timeout > 0 ) 

                {

            setTimeout(function(){

                // Check to see if the request is still happening

                if( !requestDone ) uploadCallback( "timeout" );

            }, s.timeout);

        }

        try 

                {

           // var io = $('#' + frameId);

                        var form = $('#' + formId);

                        $(form).attr('action', s.url);

                        $(form).attr('method', 'POST');

                        $(form).attr('target', frameId);

            if(form.encoding)

                        {

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

            }

            else

                        {                                

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

            }                        

            $(form).submit();

        } catch(e) 

                {                        

            jQuery.handleError(s, xml, null, e);

        }

        if(window.attachEvent){

            document.getElementById(frameId).attachEvent('onload', uploadCallback);

        }

        else{

            document.getElementById(frameId).addEventListener('load', uploadCallback, false);

        }                 

        return {abort: function () {}};        

    },

    uploadHttpData: function( r, type ) {

        var data = !type;

        data = type == "xml" || data ? r.responseXML : r.responseText;

        // If the type is "script", eval it in global context

        if ( type == "script" )

            jQuery.globalEval( data );

        // Get the JavaScript object, if JSON is used.

        if ( type == "json" )

            eval( "data = " + data );

        // evaluate scripts within html

        if ( type == "html" )

            jQuery("<div>").html(data);

            //jQuery("<div>").html(data).evalScripts();

                        //alert($('param', data).each(function(){alert($(this).attr('value'));}));

        return data;

    }

})