A sample usage from the offical doc.

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<html>
 <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
   <script src="cufon-yui.js" type="text/javascript"></script>
   <script src="Vegur_300.font.js" type="text/javascript"></script>
    <script src="Myriad_Pro_400.font.js" type="text/javascript"></script>
   <script type="text/javascript">
                        Cufon.replace('h1', { fontFamily: 'Vegur' });
      Cufon.replace('h2', { fontFamily: 'Myriad Pro' });
    </script>
 </head>
 <body>
    <h1>This text will be shown in Vegur.</h1>
    <h2>This text will be shown in Myriad Pro.</h2>
 </body>
</html>