Header Module

I would like to add a module in my header right hand side, that i would be able to change via admin panel at any time. the module would have to be restriced height wise , for example if i put the best seller module there it would not be able to push the header size down .
Heres what i have so far http://www.terabytetechnology.co.uk/estore
anyone ?

OOOOPs !! meant to post this in Module support

no takers?

This is a similar discussion:
http://forum.opencart.com/viewtopic.php?f=21&t=5939