In Dreamweaver open the Server Behaviors panel (Window -> Server Behaviors), and then select the region you want to repeat. In your case, you will need to select the tr tag, and then click the + button from the Server Behaviors panel and select Repeat Region. In the repeat region window select the record set and select all records and click OK.
Her is an example:
?php do { ?>
<tr>
<td> </td>
<td> </td>
</tr>
<?php } while ($row_Recordset1 = mysql_fetch_assoc($Recordset1)); ?>