Google Maps V3

I have spent the last few days gathering and modifying javascript code to work within Google Maps. The current version is V3 which is an improvement on V2 but is lacking in some needed areas.

First, there appears to be no inbuilt "contains" function that test whether a point lies within a polygon. Although I have a mysql procedure to do this, it's of little use here. But I found a couple of routines that do exactly what I want at

http://dyve.posterous.com/?tag=googlemaps

      if (!google.maps.Polygon.prototype.getBounds) {
        google.maps.Polygon.prototype.getBounds = function(latLng) {
          var bounds = new google.maps.LatLngBounds();
          var paths = this.getPaths();
          var path;
          for (var p = 0; p < paths.getLength(); p++) {
            path = paths.getAt(p);
            for (var i = 0; i < path.getLength(); i++) {
              bounds.extend(path.getAt(i));
            }
          }
          return bounds;
        }
      }
  
      if (!google.maps.Polygon.prototype.contains) {
        google.maps.Polygon.prototype.contains = function(latLng) {
  
          // Outside the bounds means outside the polygon
          if (!this.getBounds().contains(latLng)) {
            return false;
          }
  
          var lat = latLng.lat();
          var lng = latLng.lng();
          var paths = this.getPaths();
          var path, pathLength, inPath, i, j, vertex1, vertex2;
  
          // Walk all the paths
          for (var p = 0; p < paths.getLength(); p++) {
  
            path = paths.getAt(p);
            pathLength = path.getLength();
            j = pathLength - 1;
            inPath = false;
  
            for (i = 0; i < pathLength; i++) {
  
              vertex1 = path.getAt(i);
              vertex2 = path.getAt(j);
  
              if (vertex1.lng() < lng && vertex2.lng() >= lng || vertex2.lng() < lng && vertex1.lng() >= lng) {
                if (vertex1.lat() + (lng - vertex1.lng()) / (vertex2.lng() - vertex1.lng()) * (vertex2.lat() - vertex1.lat()) < lat) {
                  inPath = !inPath;
                }
              }
              j = i;
            }
            if (inPath) {
              return true;
            }
          }
          return false;
        }
      }

which you use like:

    if(polygon.contains(point.latLng)) {