Below is some JavaScript code to see if the syntax highlighting is working.

$(document).ready(function() {
  $('.with-default').focus(function() {
    if($(this).val() == $(this).attr('default')) {
      $(this).val('').removeClass('with-default');
    }
  }).blur(function() {
    if($(this).val() == '') {
      $(this).val($(this).attr('default')).addClass('with-default');
    }
  });
});

Now fingers crossed that it works…