Example 5: Highlighting focus

<div class="label">Select pizza toppings</div>
<ul class="checkbox">
  <li><input type="checkbox" id="cb1" value="pepperoni" onfocus="parentFocus(event)" onblur="parentBlur(event)"/><label for="cb1">Pepperoni</label></li>
  <li><input type="checkbox" id="cb2" value="sausage" onfocus="parentFocus(event)" onblur="parentBlur(event)"/><label for="cb2">Sausage</label></li>
  <li><input type="checkbox" id="cb3" value="mushrooms" onfocus="parentFocus(event)" onblur="parentBlur(event)"/><label for="cb3">Mushrooms</label></li>
  <li><input type="checkbox" id="cb4" value="onions" onfocus="parentFocus(event)" onblur="parentBlur(event)"/><label for="cb4">Onions</label></li>
  <li><input type="checkbox" id="cb5" value="gpeppers" onfocus="parentFocus(event)" onblur="parentBlur(event)"/><label for="cb5">Green Peppers</label></li>
  <li><input type="checkbox" id="cb6" value="xcheese" onfocus="parentFocus(event)" onblur="parentBlur(event)"/><label for="cb6>">Extra Cheese</label></li>
</ul>

  <script type="text/javascript">

//
//   Add focus styling to the parent (LI) element of the radio button receiving focus
//
function parentFocus( event ) {
  // Get event object  if using Internet Explorer
  var e = event || window.event;
  
  // Check the object for W3C DOM event object, if not use IE event object to update the class of the parent element
  if( e.target )
    e.target.parentNode.className = "focus";
  else
    e.srcElement.parentNode.className = "focus";
  
}

//
//   Remove focus styling from the parent (LI) element of the radio button receiving focus
//
function parentBlur( event ) {
  // Get event object  if using Internet Explorer
  var e = event || window.event;
  
  var node;
  
  // Check the object for W3C DOM event object, if not use IE event object to update the class of the parent element
  if( e.target )
    e.target.parentNode.className = "";
  else
    e.srcElement.parentNode.className = "";

}
  </script>

  <style type="text/css">
div.label {
  margin: 0;
  padding: 0;
  margin-left: 20px;
  font-size: 100%;
  font-weight: bold;
}

ul.checkbox   {
  margin: 0;
  padding: 0;
  margin-left: 20px;
  list-style: none;
}

ul.checkbox li input {
  margin-right: .25em;
}


ul.checkbox li {
  border: 1px transparent solid;
}

ul.checkbox li:hover,
ul.checkbox li.focus  {
  background-color: lightyellow;
  border: 1px gray solid;
  width: 10em;
}

  </style>