find the polygon for a certain coordinate (not picking)

How do I do to figure out which polygon that corresponds to a certain coordinate?

I have ~4000 polygons that I have to search 30-60 times (== too much) at the moment… to get my polygon… Isn´t there a more efficient way???

/grodslukaren

See if subject 2.03 helps in this link.
Good luck!
http://swdist.ucsd.edu/faqs/comp.graphics.algorithmsFAQ.txt