I played around with an header image as outlined here: http://forums.themeshaper.com/topic/adding-a-header-image
It works like a charm, but one thing I recognized is, that you can't drag the hyperlink in order to bookmark/send/etc. it. All other links are dragable, but using the method described in the post mentioned above somehow kills this feature of the header image.
I wonder why? How to change that?