multiple pull-down menus on same page

[wxdqz]

I am new to Javascript, and quickly getting the hang of it. I don't, however, know how to put two pull-down menus on the same page. When I enter code for one, it works fine. When I add a second one, it errors on me

Does anyone have a code I can use to put multiple pull-down menus (for navigation, btw) on a single page?

Thanks,
Amy