This lesson shows the steps and code to add on the Drupal side in order to load JavaScript scripts to you site. One thing to note is that the HTML5 placeholder attribute makes this plugin invalid markup.
NOTE:
There is a minor change between Drupal 6 and Drupal 7, where you should use function($)
to wrap your code. For Drupal 7 you can use:
(function($) {
$(document).ready(function() {
$('#search input.form-text').autofill({
value: Drupal.t('Search...'),
});
});
}(jQuery));