[Rails] 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
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