adsense problem

Hello, I would be very happy if someone could help me with this please!

I´m trying to add my adsense code in the main template on my website, its on the right sidebar. I´d like to place the vertical adsense banner below an other ad I show below. But when just pasting the code there, the ad does not appear in the right place, it mess completly up the website, what commands do I need to enter before and after the ad.code in order for it to show up?

</div>

<div id="ban">
<a href="http://www.xxx.com">
<img src="xxx.png" border="0" alt="" /></a>
</div>

???adsense code here or????

</div>

thank you so much in advance!!