script.js

function go(element) {
  var message;
  if (element.id === "radio1") {
    message = "You selected the number 1."
  }
  else if (element.id === "radio2") {
    message = "You selected the number 2."
  }
  else if (element.id === "radio3") {
    message = "You selected the number 3."
  }
  else if (element.id === "radio4") {
    message = "You selected the number 4."
  }
  var div = document.getElementById("request");
  div.className = 'black';
  div = document.getElementById("result");
  div.innerHTML = "<p>" + message + "</p>";
  div.innerHTML += '<p>If you are running the instrumented version of this program, you can click the "Coverage report" button to view a coverage report.</p>';
}