Changing the attribute of a ListView tag?

[VGJ]

I'm working with a 3rd. party Flash-based application which I'm trying to
integrate with our data.

To make a long story short, When the user clicks on a US state or foreign
country, I would like to un-hide a hidden <div> tag on the same page.  The
div tag is tied to a ListView - so basically, there are several hidden divs
which contain a data item (w/ a little JavaScript and the map unhides the
relevant one w/ a parameter.

So far, I'm having trouble figuring out how I can possibly do this.

Here's the tag:

<DIV wicket:id="customerList" id="#" style="DISPLAY: none">

Here's my ListItem and my attempt at re-assigning the ID value using a
WebMarkupContainer, so it ties to the values coming out of the map:

    add(new ListView("customerList", customerModel)
    {
      protected void populateItem(final ListItem item)
      {
        //current entity in loop
        final Customer customer = (Customer)item.getModelObject();

        //capture values needed for temp formatting variables
        String country = customer.getCountry() != null ?
customer.getCountry().trim() : "";
        String stateProv = customer.getStateProvince() != null ?
customer.getStateProvince().trim() : "";
        String city = customer.getCity() != null ? customer.getCity().trim()
: "";

        //category labels
        item.add(new Label("country", country));
        item.add(new Label("stateProv", stateProv));
        item.add(new Label("city", city));

        String tagId = null;

        if (!stateProv.equals(""))
          tagId = stateProv;
        else
          tagId = country;

        //modify check add-on img tag
        WebMarkupContainer container = new
WebMarkupContainer("customerList");
        container.add(new SimpleAttributeModifier("id", tagId));
        item.add(container);
      }
    });

It doesn't change the values and it doesn't throw me an error...the id value
remains "#"

What else can I do?

Thanks!