TR and TD Border test

Either tr borders don't work in ie7 or I don't know how to get them working.

HTML

<table>
     <tbody>
    <tr>
        <td>Row one</td>
    </tr>
    <tr>
        <td>Second Row</td>
    </tr>
    </tbody>
</table>

CSS

table
{
    border-collapse: collapse;
}

td
{
    border-bottom-color:  black;
     border-bottom-style: solid;
     border-bottom-width: 3px;
     border-top-color: black;
     border-top-style: solid;
     border-top-width: 1px;
}