How do Trinitarians explain verses where Jesus claims to have a God?

According to orthodox trinitarian doctrine, the Father is God, Jesus is God, and the Holy Spirit is God. Jesus is co-eqaul, eternally begotten, not made. With that in mind, how could Jesus have a God? For instance, how do Trinitarians explain verses such as the following verses in a way which is consistent with their doctrine? John 20:17 (KJV) > Jesus saith unto her, Touch me not; for I am not yet ascended to my > Father: but go to my brethren, and say unto them, I ascend unto my > Father, and your Father; and to my God, and your God. John 17:3 (KJV) > "And this is life eternal, that they might know thee the only true > God, and Jesus Christ, whom thou hast sent."