html怎么隐藏tr

<tr  style="display:none">

<tr id="sample"

            style="display: <s:if test="sample == 1">block</s:if><s:else>none</s:else>">

            <td>

                sample

            </td>

</tr>

<script type="text/javascript">

function changeTR(selectedValue)

{

    var tr1 = document.getElementById("sample");

    if (selectedValue == 0)

    {

        tr1.style.display = 'block';

    }

    else

    {

        tr1.style.display = 'none';

    }

}

</script>