Normally I used this option,
<table border="0" width="100%">
<tr>
<td>TEXT</td>
<td>FLASHFILE</td>
<td>IMAGE</td>
</tr>
</table>
however, you'll find that all the items won't stay in a horizontal row, move downwards. Now I found this plugin which does the job: Easy table creator, http://wordpress.org/extend/plugins/easy-table-creator/
Difference is, it writes the actual width of the table how you need it and all items stay in one row.