main banner

i have a question about the main banner " Your Store .. Ecommerce Aplication" where can i find the place to change that banner, i know i can change it from the admin - but what if i want to add a text banner of some affiliate site i support
<a href="http://blabla.dd.dd/?aid=MjUyNzE4MjIyMDE5" target="_blank" title="web"><img src="http://blabla.dd.dd/images/web_120x60.gif"></a>

where could i add this code to make it the main banner. Or how could i write a little bit more up to home , special offers login account

catalog/view/theme/default/template/common/header.tpl