Image behind header

Great theme! I just upgraded to the pro to get a bit more functionality. Trying to put a large image behind the header so I can still take advantage of the various header widget areas, but cant figure out how. I tried to get similar results by using a slider image but think I would be better off if I used header. In case this is really difficult, how can I change font size in slider image and get rid of arrows for next image. Thanks www.AdvancedREA.com