Question : dropdown list that passes to php var

I want to have a drop down list on a page. When a user selects something from the drop down that value is saved in a php variable ($card). So when the form on the page posts it sends the variable with it (in a hidden input).

I only have access to this one page.
The page the form is posting to is paypal.

Thanks

Answer : dropdown list that passes to php var

Here you go:

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<SCRIPT>
  var item_pre="<?php echo $SETTINGS['sitename'].$MSG_40_026.$v.' '; ?>";
  function SetItemName(c)
  {
    document.getElementById("item_name").value=item_pre+c.value;
  }
</SCRIPT>
<SELECT NAME='card' id='card' onchange='SetItemName(this)'>
  <option value='Arco'>Arco</option>
  <option value='Bp'>Bp</option>
  <option value='Chevron'>Chevron</option>
  <option value='Circle K'>Circle K</option>
  <option value='Conoco'>Conoco</option>
  <option value='Exxon Mobil'>Exxon Mobil</option>
  <option value='Gulf Oil'>Gulf Oil</option>
  <option value='Marathon'>Marathon</option>
  <option value='Mobil'>Mobil</option>
  <option value='Petro-Canada'>Petro-Canada</option>
  <option value='Phillips 66'>Phillips 66</option>
  <option value='Sams club/Wall mart'>Sams club/Wall mart</option>
  <option value='Shell'>Shell</option>
  <option value='Sinclair'>Sinclair</option>
  <option value='Speedway/Super America'>Speedway/Super America</option>
  <option value='Sunoco'>Sunoco</option>
  <option value='Texaco'>Texaco</option>
  <option value='76'>76</option>
</SELECT>
<input type="hidden" id="item_name" name="item_name" value="">