If you want to merge cells of two adjacent rows, you've to use <td rowspan="2"> on the first cell of these two rows. This number '2' will vary as per the number of adjacent rows from which you want to merge the cells.
Same goes for 'colspan'!. If you want to merge cells of two adjacent columns, you've to use <td colspan="2"> on the first cell of these two columns. This number '2' will vary as per the number of adjacent columns from which you want to merge the cells.
Jun 29, 2012