wp.js

var wp = google.gears.factory.create('beta.workerpool', '1.0');
        childCode = String(evalHandler) +
        'google.gears.workerPool.onmessage = evalHandler;';

        wp.onmessage = parentHandler;

        var childId = wp.createWorker(childCode);
        wp.sendMessage('2+2', childId);

        function parentHandler(msg, sender) {
        var r = document.getElementById('result');
        r.innerHTML = msg;
        }

        function evalHandler( msg, sender ) {
        var result = eval(msg);
        google.gears.workerPool.sendMessage(String(result), sender);
        }