Plug-in CSS Chapter 9, Example 77 (Click on the icon to view the source for copy and pasting)
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<meta http-equiv="X-UA-Compatible" content="IE=8" />
<!-- saved from url=(0014)about:internet -->
<html>
   <head>
      <title>Plug-in CSS: Example 77</title>
      <link rel='stylesheet' type='text/css' href='PC.css' />
      <script src='PJ.js'></script><script src='PC.js'></script>
   </head>
   <body>
      <form>
         Card Number: 
         <input name='creditcard' class='digitsonly' size='30' />
      </form>
   </body>
</html>