You may have seen in many blogs a leader board image after the logo.This Tutorial explains How can you move the Main Navigation Menu below Header. For this, you have to enable “Use Custom Stylesheet” option in Thesis Option Panel. It is very easy to place a LeaderBoard banner in the Thesis WordPress Theme, what you have to do is paste some sort of code in thesis custom files.

1. Open Your Thesis WordPress Theme and open “custom_functions.php” file located in the Custom folder. Copy the code below and paste it in your custom functions file.
function my_header_ad() {
?>
<div id="bang"><a href="Image URL"><img src="Image LOCATION"></a></div>
<?php
}
Upload the Image which you want to show in your uploads directory or any another site like Megaupload etc. and paste the Image Location URL in place of Image LOCATION and the put the image URL to Image URL.
2. Locate Custom CSS stylesheet in the same folder and add this code in the “custom.css” file and save it. You can change it according to your Thesis Theme Design.
.custom #header #bang {float:right;margin-top:-65px;width:800px;}