Fall into which voronoi? (Follow Up)

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Just want to follow up from my earlier post....
This is overlay() in the sp package for SpatialPolygons and SpatialPoints, 
and you will need to use the deldir package to provide polygons of bounded 
rather than infinite area - see the thread refered to here:

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/96588.html

Roger
Since the voronoi polygon layer and the point layer share the same study 
area, is there a way to do a 'spatial joint' such that I can find out 
the points fall into which polygon?

And to have a dataset like the following:

Caseid xc yc voronoi.polygon
1    -114.18   34.23        1
2  -114.25   34.25        1
3 -114.33   34.55        2
4 -114.49   34.56        3

Thanks again!!!

K.

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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no