CSS: Cell border isn't rounded for some reason
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I want to make a nice navigation bar, but for some reason, I can't get the borders of the cells on the ends of the bar to be rounded. If you look closely at the corners, you should be able to see a bit of rounding happening to the background, but not to the border for some reason.

You can see what I mean here: http://jsfiddle.net/7veZQ/299/

Here is my code:


    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Untitled Document</title>
    <style type="text/css">
    table {
        border-collapse: collapse;
        border: none;
        box-shadow: 0px 5px 10px #BBB;
    }
    .nav tr td {
        width: 160px;
        height: 40px;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        text-transform: uppercase;
        color: #666;
        border: 1px solid #999;
        vertical-align: middle;
        text-align: center;
        background: #eeeeee; /* Old browsers */
        background: -moz-linear-gradient(top, #eeeeee 0%, #cccccc 100%); /* FF3.6+ */
        background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#eeeeee), color-stop(100%,#cccccc)); /* Chrome,Safari4+ */
        background: -webkit-linear-gradient(top, #eeeeee 0%,#cccccc 100%); /* Chrome10+,Safari5.1+ */
        background: -o-linear-gradient(top, #eeeeee 0%,#cccccc 100%); /* Opera 11.10+ */
        background: -ms-linear-gradient(top, #eeeeee 0%,#cccccc 100%); /* IE10+ */
        background: linear-gradient(to bottom, #eeeeee 0%,#cccccc 100%); /* W3C */
        filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#eeeeee', endColorstr='#cccccc',GradientType=0 ); /* IE6-9 */
        text-shadow: 1px 1px 0px #FFFFFF;
        letter-spacing: 3px;
    }
    .nav tr td:hover {
        background: #F4F4F4; /* Old browsers */
        background: -moz-linear-gradient(top, #F4F4F4 0%, #E0E0E0 100%); /* FF3.6+ */
        background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#F4F4F4), color-stop(100%,#E0E0E0)); /* Chrome,Safari4+ */
        background: -webkit-linear-gradient(top, #F4F4F4 0%,#E0E0E0 100%); /* Chrome10+,Safari5.1+ */
        background: -o-linear-gradient(top, #F4F4F4 0%,#E0E0E0 100%); /* Opera 11.10+ */
        background: -ms-linear-gradient(top, #F4F4F4 0%,#E0E0E0 100%); /* IE10+ */
        background: linear-gradient(to bottom, #F4F4F4 0%,#E0E0E0 100%); /* W3C */
    }
    .nav tr td#first {
        border-radius: 5px 0px 0px 5px; 
        -moz-border-radius: 5px 0px 0px 5px; 
        -webkit-border-radius: 5px 0px 0px 5px;
    }
    
    .nav tr td#last {
        color: #09C;
        border-radius: 0px 5px 5px 0px; 
        -moz-border-radius: 0px 5px 5px 0px; 
        -webkit-border-radius: 0px 5px 5px 0px;
    }
    </style>
    </head>
    <body>
    <table class="nav" width="960" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td id="first">Home</td>
        <td>Options</td>
        <td>Prices</td>
        <td>Showcase</td>
        <td>Help</td>
        <td id="last">Order Now!</td>
      </tr>
    </table>
    
    </body>
    </html>

So what am I doing wrong?