Only show div on homepage/blog index in wordpress/php
<p>I have a wordpress site. I have a div that I only want to appear on the homepage (in the header). What type of php if statement do i need...</p>

<p>In other words:</p>

<p>only show  ....  in the header of the main blog index page. Problem is the header itself is loaded in every page. </p>

<p>Thanks!</p>
