così dovrebbe andare bene:

codice:
       <style type="text/css">
        /* <![CDATA[ */

        table, td {
            margin          : 0;
            padding         : 0;
            border-collapse : collapse;
        }
        
        table, td {
            border          : 1px #ccc solid;
        }
        
            
        /* ]]> */
        </style>
        
        
    </head>

<body>

   <table>
        <tr>
            <td>1</td>
            <td>2</td>
        </tr>
        <tr>
            <td>3</td>
            <td>4</td>
        </tr>
   </table>

</body>
</html>