Plug-in JavaScript Chapter 4, Example 25 (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 25</title>

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

</head><body>


<script>

window.onload = function()
{
   alert('This browser has a window width of: ' +
      GetWindowWidth())
}

</script>