BP Corporate banner positioning in header

Ah, apologies upfront as this might be classified as really basic, but just cant seem to get it.

I have the advertising manager plugin installed and trying to position a banner on my test site which is here http://thatmlmbeat.com/27062006/

I am trying to position the banner with the tag <?php advman_ad(advertiseheader) ?> below the about and other future page links and to the right of my header.

I've placed the tag at all places in the header file and also tried wrapping it and aligning it to the right.

Is that something that needs to be done in CSS or how would I position a banner in that position?

Thanks for the help,

George