Conditional to check if home page, show different header of vbulletin?

I want to show a different header for the home page versus all interior pages, and am wondering what conditional I should write to check for that, but also, how to create and reference a different header for the homepage.

 Add the following code at header or footer templates.

<if condition=”THIS_SCRIPT == ‘index'”>
{banner for index here}
<else />
{banner for all other pages here}