http://andresoppenheimer.com/wp-content/themes/venus/js/hint.js?ver=1.8.1

1jQuery.fn.hint = function (blurClass) {
2  if (!blurClass) { 
3    blurClass = 'blur';
4  }
5
6  return this.each(function () {
7    // get jQuery version of 'this'
8    var $input = jQuery(this),
9
10    // capture the rest of the variable to allow for reuse
11      title = $input.attr('title'),
12      $form = jQuery(this.form),
13      $win = jQuery(window);
14
15    function remove() {
16      if ($input.val() === title && $input.hasClass(blurClass)) {
17        $input.val('').removeClass(blurClass);
18      }
19    }
20
21    // only apply logic if the element has the attribute
22    if (title) { 
23      // on blur, set value to title attr if text is blank
24      $input.blur(function () {
25        if (this.value === '') {
26          $input.val(title).addClass(blurClass);
27        }
28      }).focus(remove).blur(); // now change all inputs to title
29
30      // clear the pre-defined text when form is submitted
31      $form.submit(remove);
32      $win.unload(remove); // handles Firefox's autocomplete
33    }
34  });
35};