Plug-in JavaScript Chapter 3, Example 12 (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"
<html><head><title>Plug-in JavaScript: Example 12</title>

<script src="PJ.js"></script>


<div id='heading'><h1>This is a heading</h1></div>


window.onload = function()
   Html('heading', "<h2>This is a subheading</h2>")