I have just managed to deal with an owner of a blog network to advertise on his whole network of blogs (about 30 blogs) all of them of high PR and site wide banner with a link to my website. Do you think I should ask the person to do a nofollow tag to the link of the banner. Would it be considered as spam. My website is only 9 months old and have been done serious link build for about 4 months nows! Let me know