Netscape says variable not defined?

Netscape's reporting an error that doesn't make sense:  "line 26:  anch is not
defined".  The page in question has a javascript that defines the value of 
the variable
in a javascript.  It doesn't make any sense, because the variable is 
defined a few lines
before the error is generated.  Here's the function generating the error:

function getAnch(n) {
         if (NS4) {
                 for (i=0;i<document.anchors.length;i++) {
                         anch = document.anchors[i];
                         if(anch.name == n) break;
                 }
                 menX = anch.x;
                 menY = anch.y;
         }
         if (IE4) {
                 menX = tbAnch.offsetLeft;
                 menY = tbAnch.offsetTop;
         }
         return [menX,menY];
}

The web page itself is located at:

     http://portal.atfantasy.com/includes/hm4_4/LoadMe.html

Internet Explorer renders the page accurately and I'm not sure why Netscape
generates the error.  Could you take a look at it and let me know what the 
problem
is?

Thanks! =)

-Ed
osmosis(at)atfantasy.com

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