Sorry for the delay Scandaglia
Somme test is necessary to put the code in your theme (in index, your promote is clickable for all navigation page. If you choose "home.php" the promote is only clickable on home page).
You can put the code where you want (bottom or top) in single.php, in home.php or in index.php (copy/past this code in several of these files if you want). If you use the top clickable zone, put the php code at the ideal zone for the top zone.
The width attribute is necessary (this option define the invisible "div clickable"). If you leave this blank, the background made not clickable, the width for the invisible "div clickable" element argued 0 by defaut. I add this option to fit width clickable zone to the theme).
By defaut, the height of this element take a "max auto" value. If you don't define the height attribut, it does not matter.
For the link target for your partner, you put this in the admin zone
> Appaerence > Define link target. Left part and right part "invisible div but clickable" can take different link value (and top also)
The flash zone support also the script if is necessary (Google ads, etc...)