Penrake demo

gistfile1.htm

<form action="" method="post" id="simple_callback_form">
  <p><input type="text" id="name"/></p>
  <p><input type="text" id="email"/></p>
</form>

<script type="text/javascript">
  $('#name').penrake({value:"Name"});   
  $('#email').penrake({value:"Email",active:"green"});   
</script>