การรับค่า ด้วย JSP ครับ 1.อยากทราบว่า input ตัวนี้ เค้าเรียกว่าอะไรเหรอครับ

<form name="frmMain" action="testpick.jsp" method="post" >
  <table width="353" border="0" cellspacing="4" cellpadding="0">
    <tr>
      <td><div align="center"><b>Left</b></div></td>
      <td rowspan="2"><div align="center">
        <input type="button" name="MoveRight" value="Move To Right -> " style="width: 120px;" onClick="MoveOption(this.form.ddlLeft, this.form.ddlRight)">
        <br>
        <br>
        <input type="button" name="MoveLeft" value=" <- Move To Left" style="width: 120px;" onClick="MoveOption(this.form.ddlRight, this.form.ddlLeft)">
      </div></td>
      <td><div align="center"><b>Right</b></div></td>
    </tr>
    <tr>
      <td>
	  <select name="ddlLeft" id="ddlLeft" size="12" multiple style="width: 100px;">
        <option value="Option 1">Option  1</option>
        <option value="Option 2">Option 2</option>
        <option value="Option 3">Option 3</option>
        <option value="Option 4">Option 4</option>
        <option value="Option 5">Option 5</option>
        <option value="Option 6">Option 6</option>
        <option value="Option 7">Option 7</option>
        <option value="Option 8">Option 8</option>				
      </select>
	  </td>
      <td>
	  <select name="ddlRight[]" id="ddlRight" size="12" multiple style="width: 100px;">
      </select>
	  </td>
    </tr>
  </table>
  <br>
  <input name="btnSubmit" type="submit" id="btnSubmit" value="Submit" >
</form>

<%

String ll[]=(String[])request.getParameterValues("ddlRight");
out.print(ll.length);
out.print(ll[1]);
%>