function init() {
  $("start").onclick=start;
  $("stop").onclick=stop;
  start();
}
window.onload=init;

function start() {
  $("start").disabled = true;
  $("stop").disabled = false;
  $("process").innerHTML = "Running";
}

function stop() {
  $("stop").disabled = true;
  $("start").disabled = false;
  $("process").innerHTML = "Idle";
}