[SOLVED] How to Switch Languages Using Menus

Hello,
I have a simple website that I would like to post in English and Spanish. I have already translated the English pages and given the Spanish versions separate URLs, so I don't need a translation plugin, but I am confused about how to tell the site to use a different menu to direct users to the Spanish pages when they want to read the site in Spanish-along the lines of 'if Spanish, use menu 2, if English, use menu 1,' something like that-in Atahualpa 3.7.3. Any thoughts about the most effective way to do this?
Thanks in advance.
Lore