[jQuery] Help with div, css selector, and form field...

[Loony2nz]

I need some help with jquery's syntax for how to pop an error message
when a select field is blank.

There's a form that uses the same css class for all of it's form
fields.  However, I would like to check to see if at least one section
of the form is not "blank".

Here's my code:

<div id="schoolchoices">
        <select name="9378_choice" class="schoolDropList">
                <option value="">Select something</option>
                <option value="10">10</option>
                <option value="20">20</option>
                <option value="30">30</option>
                <option value="40">40</option>
                <option value="50">50</option>
        </select>
        <br /><br />
        <select name="3483_choice" class="schoolDropList">
                <option value="">Select something</option>
                <option value="10">10</option>
                <option value="20">20</option>
                <option value="30">30</option>
                <option value="40">40</option>
                <option value="50">50</option>
        </select>
        <br /><br />
        <select name="2384_choice" class="schoolDropList">
                <option value="">Select something</option>
                <option value="10">10</option>
                <option value="20">20</option>
                <option value="30">30</option>
                <option value="40">40</option>
                <option value="50">50</option>
        </select>
        </div>

I need to check to see if at least one of the above is not "blank".
Here's the catch.  The list of school choices is variable.  It can be
1 school choice, it could be 4 school choices.  But it's dynamically
generated and I need to create a jquery js function that will validate
at least 1 of the x school choices are chosen.  The value of the
select statement is dynamically generated to use the school's database
ID.

There are other form elements to this sample code, but I only need
this section of the form validated.

Thoughts on how to progress?

Thanks!