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, adata)
        {
                //create form
                var formId = 'jUploadForm' + id;
                var fileId = 'jUploadFile' + id;
                var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
                var oldElement = jQuery('#' + fileElementId);
                var newElement = jQuery(oldElement).clone();
                jQuery(oldElement).attr('id', fileId);
                jQuery(oldElement).before(newElement);
                jQuery(oldElement).appendTo(form);



                var urlf = jQuery('<input name="URLF" type="hidden" value="'+adata+'">');
                jQuery(urlf).appendTo(form);

                /*var max_size = jQuery('<input name="max_size" type="hidden" value="'+adata.max_size+'">');
                jQuery(max_size).appendTo(form);
                var min_size = jQuery('<input name="min_size" type="hidden" value="'+adata.min_size+'">');
                jQuery(min_size).appendTo(form);
                var min_scale_type = jQuery('<input name="min_scale_type" type="hidden" value="'+adata.min_scale_type+'">');
                jQuery(min_scale_type).appendTo(form);
                var big_scale_type = jQuery('<input name="big_scale_type" type="hidden" value="'+adata.big_scale_type+'">');
                jQuery(big_scale_type).appendTo(form);
*/
                //set attributes
                jQuery(form).css('position', 'absolute');
                jQuery(form).css('top', '-1200px');
                jQuery(form).css('left', '-1200px');
                jQuery(form).appendTo('body');
				
				//alert(jQuery(form).html());
                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, s.adata);
                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);
                                //clear up the created form after file uploaded.
                jQuery(io).unbind()

                setTimeout(function()
                                                                        {        try
                                                                                {
                                                                                        jQuery(io).remove();
                                                                                        jQuery(form).remove();
                                                                                        jQuery('#' + s.fileElementId).val('');

                                                                                } 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 = jQuery('#' + frameId);
                        var form = jQuery('#' + formId);
                        jQuery(form).attr('action', s.url);
                        jQuery(form).attr('method', 'POST');
                        jQuery(form).attr('target', frameId);
            if(form.encoding)
                        {
                form.encoding = 'multipart/form-data';
            }
            else
                        {
                form.enctype = 'multipart/form-data';
            }
            jQuery(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;
        //alert(data);
        // 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);
			         //alert(jQuery('param', data).each(function(){alert(jQuery(this).attr('value'));}));
        return data;
    }
})