Plug-in JavaScript Chapter 5, Example 34 (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">
<html><head><title>Plug-in JavaScript: Example 34</title>

<script src="PJ.js"></script>
<script>Initialize()</script>

</head><body>

<center>Click the buttons<p>
<input type='submit' value='25 percent' onclick='Opacity(this, 25)' />
<input type='submit' value='50 percent' onclick='Opacity(this, 50)' />
<input type='submit' value='75 percent' onclick='Opacity(this, 75)' />