Hmm..........wouldn't it be nice if life is so easy lol. May be one day. I guess first you must find out or decide what size of header you want. How or more precisely if you are designing a new site from scratch, the approach you take towards it. In your case my guess is your friend has a page already and there is either a blank space or a header in place which you want to replace. In this case since the page layout and property is set, you just have to find out the size ( pixel count ) of the old header, from there resize the header you made to fit into that space. However if you want to replace a header with a different size, work out the size you want first then slice it in photoshop for best result. Good luck...........