onmessage = function(e) {
  if (e.data.length < 3) {
  console.log('Message not processed');
  } else if (e.data[2].toLowerCase().replace('ozemail.com.au/~mkuulma/','rjmprogramming.com.au/').replace('localhost:8888/','rjmprogramming.com.au/').indexOf('rjmprogramming.com.au/') != -1) {
  console.log('Message received from main script ... ' + e.data[2]);
  var workerResult = '';
  if (e.data[1].indexOf('/') != -1) {
    workerResult = 'Result: ' + eval(eval(e.data[0]) / eval(e.data[1].replace('/','')));
  } else if (e.data[1].indexOf('-(') != -1) {
    workerResult = 'Result: ' + eval(eval(e.data[0]) - (eval(e.data[1].replace(')','').replace('-(',''))));
  } else if (e.data[1].indexOf('+') != -1) {
    workerResult = 'Result: ' + eval(eval(e.data[0]) + eval(e.data[1].replace('+','')));
  } else if (e.data[1].indexOf('*') != -1) {
    workerResult = 'Result: ' + eval(eval(e.data[0]) * eval(e.data[1].replace('*','')));
  } else {
    workerResult = 'Result: ' + (Math.pow(e.data[0], e.data[1]));
  }
  console.log('Posting message back to main script');
  postMessage(workerResult);
  } else {
  console.log('Message unprocessed');
  }
}