I'd recommend ditching KML if possible. Then you end up with something
just a little bit more complicated than this:
http://econym.org.uk/gmap/categories.htm
The big difference is that you can't just do hide(category) and
show(category) based on an individual checkbox. Whenever a checkbox
changes you have to scan through all the markers and test each one
against both sets of checkboxes.
If you can't ditch KML then you'd have to use a third party KML parser,
like GeoXml (because GGeoXml doesn't expose the markers). Glue all your
data together in one big KML file. Then you somehow have to encode the
category information into an existing KML field that GeoXml gives you
access to, that might be a bit awkward. Write your own {createmarker}
function to extract this information from what GeoXml gives you and
attach it to the marker. That gets you back to about the same sort of
place that you'd be at if you ditched KML.
--
Mike Williams
Back from exile!
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