Help: Error in IE makes page with gmap unviewable

Have a look at this page in IE6:

http://www.laser-scotland.org.uk/results06-gmap.php

You will get a popup error dialog after the page displays and when you
click ok ie is redirected to a bad ip address.

Yet in FX the page displays.

It's driving me nuts! To prevent it all I need to do is remove the
Jscript line:

var map = new GMap(document.getElementById("map"));

But then I get no map!