multilingual blocks in drupal6
If you install the Internationalization suite of modules, you can enable the Internationalization blocks module (called Translate Blocks).

This will allow you to assign a language (or languages) to each block.

This way, you can create a menu for each language and then assign a language to each menu block.


Note that there is also a Translate Menu module in the Internationalization suite.  This module allows you to create one menu with items of multiple languages.  However, this can get confusing and complicated very fast and is often difficult to maintain over time.  For this reason, most people create separate menus for each language as described above.