I've got a nice TMS tile set of the world that I'd like to selectively patch. 
For instance, I have a tile subset with names in French. Only the tiles that 
are different are in this subset. What would be the best method of dynamically 
switching the tiles?

if (TileInPatchSet)
   return PatchTile;
else
   return BaseTile;

I could do this in the getTile() function passed to OL to service the layer, 
but a double fetch would be wasteful so I wonder if there is a server solution 
that would be better? Shadowing with "lndir" would create a lot of symbolic 
links given the tile count. Is there any other method supported by the OS or 
web server?

Regards,
Warren
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