Advice

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I have two listboxes, the second is empty. When I select in the 
first one an item, I would like to fill the second one. Could someone 
give me an eays solution how I can realize this.

      <h:selectManyListbox value="#{sell.assortments}" size="6" 
immediate="true"
                        valueChangeListener="#{sell.assortmentChange}">
          <f:selectItems value="#{sell.assortmentChoice}" />
        </h:selectManyListbox></td>
      <td><h:selectManyListbox value="#{sell.categories}" size="6"
>
          <f:selectItems value="#{sell.categoryChoice}" />
        </h:selectManyListbox>


Urs