Are they going to turn all of The Chronicles of Narnia books into Movies?

As of right now, Walden Media and Disney have made two Narnia movies and are working on a third. "The Lion, the Witch, and the Wardrobe" came out in 2005 and is the first. "Prince Caspian" came out on May 16, 2008 and is the second. "The Voyage of the Dawn Treader" is the third one that they are currently working on, it is scheduled to come out in 2010. They have also said they hope to make all 7 of them but are waiting to see how well the first three do. There have been rumors that they have already started looking for a director for the fourth movie "The Silver Chair".