var wwm = Ext.ux.WebWorkerManager;
                var webworker0, webworker1, webworker2;


    var blob = [
        'var timeMin = 0;' ,
        'var timeSec = 0;' ,
        'function start () {' ,
            'postMessage ({event: "start", data: "Started!"});' ,
        '}' ,
        'function stop () {' ,
            'postMessage ({event: "stop", data: "Stopped!"});'  ,
            'close ();' ,
        '}' ,
        'function compute () {' ,
            'var dStart = new Date ();' ,
            'postMessage ({event: "compute", data: "Computation started!"});' ,
            'for (var i = 0; i < 3000000000; i++) {}' ,
            'var dEnd = new Date ();' ,
            'var diff = dEnd - dStart;' ,
            'timeSec = Math.round (diff/1000);' ,
            'timeMin = Math.round (timeSec/60);' ,
            'postMessage ({event: "compute", data: "Computation terminated!"});' ,
        '}' ,
        'function log () {' ,
            'postMessage ({event: "log", data: "Last computation time: " + timeMin + "m" + timeSec + "s"});' ,
        '}' ,
        'onmessage = function (message) {' ,
            'switch (message.data) {' ,
                'case "start":' ,
                    'start ();' ,
                    'break;' ,
                'case "stop":' ,
                    'stop ();' ,
                    'break;' ,
                'case "compute":' ,
                    'compute ();' ,
                    'break;' ,
                'case "log":' ,
                    'log ();' ,
                    'break;' ,
                'default:' ,
                    'postMessage ({event: "unknown", data: "Unknown command."});' ,
            '}' ,
        '}'
    ].join ('');


    webworker0 = Ext.create ('Ext.ux.WebWorker', {
            blob: blob ,
            itemId: 'Web Worker 0' ,
            listeners: {
                start: function (ww, message) {


                } ,
                compute: function (ww, message) {

                //alert("hey");
                $('#story').attr('src','http://url/senc/SAMPLE.html');
                } ,
                log: function (ww, message) {

                } ,
                stop: function (ww, message) {

                } ,
                unknown: function (ww, message) {

                }
            }
        });




                 wwm.register (webworker0);
                 webworker0.send('compute');