Yes this is certainly an old thread, but with some good discussion in it.
For a more recent and more extensive thread regarding the Deity of Christ , see
http://www.able2know.com/forums/viewtopic.php?t=51117&start=0
This thread was started by Neo just a few weeks ago.
Regarding the prophecy of Isaiah, the NT answers Frank's question
Frank Apisa wrote:And where exactly does it say that when Jesus was born, he was called Immanuel.
in Matthew 1
20But while he thought on these things, behold, the angel of the LORD appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Ghost.
21And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins.
22Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying,
23Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.