Simply include one javascript source file to your html and you will be able to do simple tracing and interspection during runtime.  Simply click on the "button" to display a form.

 <script src="/dhtml/jsd.js" type="text/javascript"></script>

This page has button to active the JSD too.  Can you find it?  It is 5 diamonds.

Click here to download jsd.js

Click here to see a very simple example page.