Navbar Customization - Display Ad on Homepage Only

[Levelbest]

I've given up on using the weighting system trying to figure out how to make this happen... so I need some help. In VB3, I used the following code to implement an ad in the navbar that displayed an AD only on the homepage.

Need help converting it to VB4 and where to place it.

<if condition="THIS_SCRIPT == 'index'">

<!-- / ADS BEGIN -->

<table class="tborder" cellpadding="$stylevar[cellpadding]" 
cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
  <tr>
      <td class="tcat" width="100%">INTERCOT Sponsors</td>
  </tr>
  <tr>
     <td class="alt1" width="100%">

THE AD CODE GOES HERE
 
     </td>
  </tr>
</table>

<!-- / ADS END -->

</if>

Thanks in advance!

JOHN