[Typo3] How do I do a conditional wrap?

[Simon]

I've been search all day to find out how to perform a wrap only is a 
value is in the database.

So far I have this and it's working well to wrap the content:

temp.subparts.CONTENT_RIGHT < styles.content.getRight
temp.subparts.CONTENT_RIGHT {
	wrap = <div id="boxout"> | </div>
}

But if the there isn't any content in Right then I still have this empty 
DIV floating around causing problems. I need to wrap 
temp.subparts.CONTENT_RIGHT only is temp.subparts.CONTENT_RIGHT is not NULL.

I've searched these news groups, have trawlled through various manuals 
inc the slightly scary TSref and still can't work out how to do this. 
I'm sure it's really easy but could someone point me in the right direction.

Cheers everyone.
Simon