php mssql

Have a connection to a mssql database
I have got it talking and pulling in the data which I have use mssql_query
and mssql_fetch_assoc
 I use this statement to show the results

//header

    if (!$header) {
        echo '<thead>';
        echo '<tr>';
       for ($i = 1; ($i + 1) <= mssql_num_fields($data); ++$i) {
            echo '<td>' . ucfirst($row[$i]) .ucfirst($row[$i]) . '</td>';
			}
        echo '</tr>';
        echo '</thead>';
        echo '<tbody>';
       $header = true;
    }
// row
    echo '<tr>';
    foreach($row as $value) {
        echo '<td>' . $value . '</td>';
    }
    echo '</tr>';
}
echo '</tbody>';
echo '</table>';   

the sql statement select two fields and in a SUM(coloumn1), and SUM (coloumn2)
but I now want to add these two values together