Try it out:
<a href="./"
   onClick="guided_tour=window.open
   (
'TourGuide.PopUp.html', 'mainscreen',
'scrollbars=yes,status=no,menubar=no,toolbar=no,resizable=yes,width=300,height=400'
   )
">
Tour Guide Java Applet
</a>

or, the simpler

<a href="./"
   onClick="guided_tour=window.open
   (
'TourGuide.sitemap.html', 'sitemap',
'scrollbars=yes,status=no,menubar=no,toolbar=no,resizable=yes,width=512,height=384'
   )
">
Plain JavaScript Window Showing Table of Contents Page
</a>

<br>
See the
<a href="TourGuide.java.html">TourGuide.java Source code</a>
and the <a href="TourGuide.links.txt">links information file</a> it uses.