window.onload = function(){
var w1= new Worker("worker.js");
var w2= new Worker("worker.js");
var w3= new Worker("worker.js");
var w4= new Worker("worker.js");
var w5= new Worker("worker.js");

var worker = [w1,w2, w3, w4, w5]

for (i =0; i < worker.length; i++){

worker[i].postMessage("sleep");

    worker[i].onmessage = function(event) {
         ndate = new Date();
         message = ndate + " Worker says " + event.data;
         document.getElementById("output").innerHTML = message;
         }
}


}