Problem with image map in Navigator 4.79

Peace be to all beings!

I'm stumped with this thing.  I've gone over it several times, checked my 
books, checked the archives here and on the basics list, tried what I've 
found, and I still can't get this image map to work completely.  Behold:

<img src="menu2.jpg" width="105" height="471" border="0" usemap="#menumap" 
alt="Menu">

<map name="menumap">
<area alt="Home" coords="7,34,102,10" href="main.htm" target="main">
<area alt="Short talk about Freemasonry" coords="10,77,103,54" 
href="shorttalk.htm" target="main">
<area alt="Joining the Lodge" coords="8,119,100,98" href="membership.htm" 
target="main">
<area alt="The Ashlar -- Lodge news and events" coords="8,162,102,139" 
href="trestleboard.htm" target="main">
<area alt="Past Masters" coords="10,204,103,182" href="pm.htm" target="main">
<area alt="Directions to the Lodge" coords="8,247,101,224" 
href="directions.htm" target="main">
<area alt="The Order of the Eastern Star" coords="10,289,102,267" 
href="easternstar.htm" target="main">
<area alt="Related Links" coords="9,331,102,310" href="links.htm" 
target="main">
<area alt="Grand Lodge of Alabama" coords="8,376,101,350" 
href="http://alagl.org" target="_blank">
<area alt="GoMasonry Masonic search directory" coords="8,394,100,419" 
href="http://www.gomasonry.com" target="_blank">
<area alt="Site Credits" coords="8,458,103,437" href="credits.htm" 
target="main">
</map>

The above works fine in IE 5.5, but only one link works in Netscape 
4.79.  Can anyone give me a reason why?  I'm wondering if it's because I'm 
aiming at a second frame window with this map, but that doesn't explain why 
one of the exterior links works and the other doesn't.  I have text links 
in the main frame, so it's no loss of navigation yet, but I'd like to solve 
this problem.  Any suggestions, working or not, earn a beverage of your 
choice on my buck at alt.callahans.  Questions are welcome to elucidate the 
problem; I usually end up leaving off something vital in my first 
explanation, though I can't see what I've missed this time.

Bruce Klaiss
Harper Information Services

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