Plug-in JavaScript Chapter 5, Example 39 (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 39</title>

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

</head><body>

<center><br />
<span id='sp1'>Crossover</span>
<img id='i1' src='i3.gif' />
<img id='i2' src='i4.gif' />

<script>

window.onload = function()
{
   Locate(Array('i1', 'i2'), ABS, 0, 0)
   FadeToggle('i2', 1, 1)
   O('sp1').onmouseover = function() { FadeBetween('i1', 'i2', 500, 1) }
   O('sp1').onmouseout  = function() { FadeBetween('i2', 'i1', 500, 1) }
}

</script>