> Practically  I have in a MS SQL 2005 a  list of addresses of shops, and I
> need to know, based on a chosen shop in a radius of 30 km if there are other
>  stores in the same area.

Don't do that in javascript at all.
See
http://code.google.com/apis/maps/articles/phpsqlsearch_v3.html
for an SQL based approach

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