Conditional for navbar on index.php only?

[yoyoyoyo]

Is there a way I can add a conditional so a phrase only appears in the navbar, under the welcome message/private messages notice, if they are viewing the index.php?

[Andreas]

<if condition="THIS_SCRIPT == 'index'">
Your stuff here
</if>

[yoyoyoyo]

<if condition="THIS_SCRIPT == 'index'">
Your stuff here
</if>

thanks much! :D