Plug-in JavaScript Chapter 11, Example 84 (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 84</title>

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

</head><body>

<script>

window.onload = function()
{
   value = ProcessCookie('read', 'username')
   if (value != false)
      alert("The value returned for 'username' is: '" + value + "'")
   else alert("The cookie 'username' has no value.")

   alert("Click OK to store cookie 'username' with the value 'fred'")
   ProcessCookie('save', 'username', 'fred', 60 * 60 * 24)

   alert("Click OK to retrieve the cookie")
   value = ProcessCookie('read', 'username')

   if (confirm("The value returned for 'username' is: '" + value     +
      "'\n\nNow, either click [OK] to delete the cookie, and then\n" +
      "reload the page to see if the cookie has been erased.\n\nOr " +
      "click [Cancel] to do nothing, and then reload\nthe page to "  +
      "see if it has retained its value.\n"))
      ProcessCookie('erase', 'username')
}

</script>