Greek Mythology permeates Plato’s Atlantis story as it does virtually all Classical Greek writing. Carlos Parada has an interesting website^(a), for those wishing to pursue a study of it, and also includes a few interesting pages on Atlantis. Another site^(b) worth a look is theoi.com.
^(a) http://homepage.mac.com/cparada/GML/index.html
^(b) http://www.theoi.com/