[Javascript] select list option sending

[David S Levy]

Hey.  I'm trying to make a dropdown(select) list of locations in a form, but instead of sending off the location name on submittal, I'd like to send an associated location ID, since I'm working with a database.  I was wondering if I can set up a form element with a name and without a type on selection of a given dropdown option.  To elaborate:

Let's say I have a dropdown list of the following cities:

New York
Los Angeles
Boston

And each of these cities has associated with it a location ID, like:
New York - 17
Los Angeles - 13
Boston - 6

I'd like a way to list the cities but send the ID's.  Could I do something within the <option> tag like onselect="this.form.city_ID=17" for New York?  If yes, could I just do it like that or would I need to declare the form element city_ID as a hidden variable or something along those lines?  If not, does anyone have any ideas?  I hope my javascript idea is understandable, I'm just turning to this language in order to move along a project that's primarily in PHP.

Thanks,

David.
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