Does anyone know of a utility that will rewrite an html page in javascript example:

html:
<body>
<b>some text here</b>
<hr>
<b>some more text</b>
</body>


javascript:
document.write('<body>');
document.write(' <b>some text "here"</b>');
document.write(' <hr>');
document.write(' <b>some more text</b>');
document.write('</body>');

Jeremy