How do I delete table border ?

In my site homepage middle widget area, I want to make tables without border. As of now, you can see table border there, http://englishjump.net/.

The html code is

<table style=”height: 30px;” width=”570″>

<tbody>

<tr>

<td style=”text-align: center;”>courses</td>

<td style=”text-align: center;”>courses</td>

<td style=”text-align: center;”>courses</td>

</tr>

</tbody>

</table>

1. How can I change the code above to delete border?

2. How can I set the width of each column at a fixed pixel? It means how I can make each cell have the same width whatever contents I enter into it.

Thank you

Jeonghun