How to have 2 Adsense Units side by side?

The code for having adsense unit side by side which can be effectively used is as stated below. By virtue of this placement one will be able to see rectangular or square ads placed side to side and thus as a result the blank space which is generally visible is covered because of this technique and results in a high CTR. Code is as below: An error is occuring due to it being in HTML language. I will find the remedy for the same and post it here.
<table>
<tr> <td>Code 1</td> <td>Code 2</td> </tr>
</table>