[Google Maps API v2] looping through polygons

Hi,

so, this seems like a basic question, but I've searched around and
can't find a definitive answer.

I want to loop through an array of polygons to use the show/hide by
categories method.

So for example, if
for (var i=0; i<gmarkers.length; i++)
loops through the markers, and

for (var a=0; a<gpolylines.length; a++)
loops through the polylines, then shouldn't

for (var i=0; i<gpolygons.length; i++)
loop through the polygons?

or should it be
for (var a=0; a<gpolygons.length; a++) ?

or does it not matter as long as it's consistent?

or is it not possible to load polylines and polygons from the same xml
file?

and if it is right, how come I get a "category is not defined" error
when I try to use it here: http://www.xelawho.com/map/zones.htm

thanks in advance for any pointers.

Lucas

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