You create four empty elements in your polys array
   var polys = new Array(4);
then .push the polygons onto the end of that array.

When you attempt to loop through that array, using
  for (var z = 0; z < polys.length; z ++ )
the first four elements are still undefined.
  polys[z].Contains(point)
crashes because poly[0] is undefined.

Try
   var polys = new Array();

-- 
Mike Williams
http://econym.org.uk/gmap



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