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Get previous element in control hierarchy?

In my javascript, I have a reference to a select box (I got through document.getElementById).  The element right before this dropdown is a checkbox, and I need to get an reference to this as well.  I don't know the id (it's automatically generated).

Isn't there a function that I can use to easily get this prior element in the hierarchy?
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Thanks, that's exactly what I need.  And good call about the Firefox issue, I use Firefox and probably would have spent all afternoon trying to figure out why I wasn't getting what I hoped for!

I just put it in and it working great!
JavaScript
JavaScript

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and in almost every mainstream web browser.

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