B

A copy of the JavaScript functions in the head element:

// b.js

// onmouseover event handler
function mouse()
  {
  var image = document.getElementById("arrow");
  image.src = "green-arrow.gif";
  }

// onmouseout event handler
function mouseout()
  {
  var image = document.getElementById("arrow");
  image.src = "blue-arrow.gif";
  }