OK I got it! The frontend language options solved the problem and it works great with a condition in the free PHP section such as:

if ($template == "electric_standard_jan2011" and $language_code == "fr") return 351;

Therefore if $language_code == "en" it wont return anything in this case, which is what I want.

I thought I tested the frontend option, I must have done something wrong... anyway, now it works!

As for the error :

Parse error: syntax error, unexpected T_IF in /home/guitar88/public_html/modules/mod_metamod/helper.php(606) : eval()'d code on line 4

There was a synthax error. I have used "and if" instead of "and". 

This thread is closed.

Thanks a lot, this is GREAT!

Alex.