jquery / php select multiple selected options from php array in jquery

I'm trying to produce a multiple select list with selected options based from a php array, in jquery. I can't seem to get it working, this is my code:

My select list:

<select name="modules[]" id="modules" class="inputbox" size="10" multiple="multiple">
  <option value="1">Module 01</option>
  <option value="2">Module 02</option>
  <option value="3">Module 03</option>

My PHP/JQuery (attempt):

<script type="text/javascript" language="javascript">
$modules = explode(';',$row->modules);
if (is_array($modules)) {
    foreach($modules as $moduleID) { 
    jQuery("#modules").val("<?php echo $moduleID; ?>");
} else { 
jQuery("#modules").val("<?php echo $row->modules; ?>");

Which looks like (plain jquery):

<script type="text/javascript" language="javascript">

And this is my php array (after being exploded):

    [0] => 3
    [1] => 1


You need to pass an array to val():

<script type="text/javascript">

From the jQuery docs:

This method is typically used to set the values of form fields. For <select multiple="multiple"> elements, multiple <option>s can be selected by passing in an array.

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