Ok Tom

I think you have identified a bug here... I have been playing with  
this stuff recently in the SVN and I have changed the code a little  
bit - I have attached the new map_functions2.php file, which should  
enable it to work. There was some confusion with JS layer_names - I  
hope this one works!

copy this file into you php/map/ directory - it should sort out the  
problem.

Stu