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 = 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);

		//set attributes

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

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

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

		jQuery(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 

										{

											jQuery(io).remove();

											jQuery(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 = 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;

        // 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).evalScripts();

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

        return data;

    }

})