[OpenMap Users] creating layer using zcta data from us census

The requirements I have been given is to display a map of a state(or
whole US for that matter) and "shade" the colors of certain region on
the map as defined by 3 digit zcta as given in an ArcView Shapefile I
have gotten from the US census. The display is via the web so I know to
use the SimpleHttpServer class for that and I have already worked on
some sample code to that end. My question at this point is how do I take
the input of, say, the zipcode(s) given and then highlight the
appropriate region(s) on the map? I guess this should be some sort of
layer, is that right? Any other general advice would be appreciated
before I start slogging through the code....... :)
Best Regards,
Adam

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