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Well, I finally figured this out myself. After doing quite a bit of reading from various places I did not find any direct reference to where the values for Smarty variables are kept. I did learn someting about Smarty, though. I knew that variables in modules are kept in language/english/main.php. Therefore I decided to try making a dir structure like that within the theme directory. Then I created a PHP file, main.php, and entered the define statements.
That worked! I was surprised almost, but pleased. I now wonder if these definitions could be put in XOOPS_ROOT/language/english/main.php and still work. Some time I'll try it, but my instinct was to keep the theme Smarty definitions separate, as indicated above.
Perhaps this will help someone else. It might be a good idea to put something in the readme file to the effect that one needs to enter define statements for the Smarty variables (whereever is the best place to keep them).
Barry Cooper
Barry Cooper
Sweet Home, Oregon