How to align the banner in the first post to the right?

[Tomzl]

I tried to align the banner in the first post to the right by using the ad_showthread_firstpost_start template.

I entered the code:

<div style="float: right; margin: 0 0 5px 5px;">
<a href="URL" target="_blank"><img src="URL" border="0"></a>
</div>

This works fine with regular text but breaks when the first post is a quote (see the picture below).

http://img410.imageshack.us/my.php?image=napaka.gif

How do I align the ad to the right so that the quoted text will be displayed on the left side of the banner and not below?

[Tomzl]

Anyone?