Q: Rails 3 Multiselect input param

In Rails 3, I have a multi-select form control (fig. 1). When I select more than 1 value, Firefox sends both values (fig. 2). But only the last value gets sent as a input value to my controller (fig. 3). How do I get all those values passed on to my controller?

      <form action="html_items/search" method="post" >

        <!-- Criteria -->         <div style="float:none;">           <label>Content Provider </label>           <select multiple id="content_provider" name="content_provider">             <option value="FLR">Flare</option>             <option value="SLDT">Slashdot</option>           </select>         </div>

        <input type="submit" value="Search" />

      </form> fig. 1

Parametersapplication/x-www-form-urlencoded content_provider FLR content_provider SLDT fig. 2

PARAMs[{"content_provider"=>"SLDT", "controller"=>"html_items", "action"=>"search"}] ... fig. 3

Thanks Tim