If you are running GeoServer you can make a WFS request, which will return
the BBOX for the feature queried.  The nice thing about this approach is
that you don't have to write any server side scripting- you can just use
JavaScript to piece together the variables needed to build the WFS URL.

-----
Bryan R. McBride, GISP
http://www.bryanmcbride.com bryanmcbride.com 
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