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