// Find all the <li> elements, to attach the event handlers to them
  var li = document.getElementsByTagName(“li”);
  for ( var i = 0; i < li.length; i++ ) {
  
      // Attach a mouseover event handler to the <li> element,
      // which changes the <li>s background to blue.
      li[i].onmouseover = function() {
          this.style.backgroundColor = ‘blue’;
      };
  
      // Attach a mouseout event handler to the <li> element
      // which changes the <li>s background back to its default white
      li[i].onmouseout = function() {
          this.style.backgroundColor = ‘white’;
      };
  
  }