Can some one help me read this crochet pattern?

I really want to make an Afghan and this is the pattern I would like: (a href="http://www.allcrafts.net/fjs.htm?url=pandacrochet.8m.com/crossmyheart.html)" rel="nofollow"http://www.allcrafts.net/fjs.htm?url=pan…/a preferably the purple and white one. I know how to make a granny square, I know how to make a heart. I just don't get if I should make the hearts and connect them with the second color, but if so how would I make the square like that with the hearts in the middle. If you can break it down a little bit that would be great. =]