Adbrite buying

window.document.getElementById(‘post-3845’).parentNode.className += ‘ adhesive_post’;I see you can choose from Adbrite lots of sites "to advertise on" from the "site directory", like this link:
http://www.adbrite.com/mb/commerce/purchase_form.php?other_product_id=325382&fg_state=a%3D1.938%26page%3D1%26
However I don’t get it how can you buy, there’s no buy link or checkout on the page.
Can anyone help?

Original post by webyg