Shabir Ally on Jesus and Muhammad in the Bible

http://www.answeringmuslims.com
According to the Qur’an (7:157), the Bible contains clear prophecies about Muhammad. Shabir Ally tries to water down this claim by suggesting that the Old Testament contains only vague prophecies about Jesus, and therefore that Muslims only need to find vague prophecies about Muhammad. But is it true that the Old Testament contains only weak references to Jesus?