I would use
Code:
<if condition="THIS_SCRIPT != 'index'">
Basically, it declares "Show this bit of code on every page except index.php"
Just wrap it around anything you don't want to show on your index page.
If you happen to have renamed your index.php page to something like forums.php just edit the code appropriately.
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So, if I understand your plan you should open your navbar template and find the line
Code:
<td class="alt1" width="100%">
(It's right there near the beginning of the template)
Replace it with
Code:
<td class="alt1" width="100%">
<if condition="THIS_SCRIPT != 'index'">
Then find the first
Replace it with
Can't say as I understand
why you would do it, but there it is.