hi. This also was discussed in old forum here: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1258047495
You should really change the EEPROM.write example as it is wrong and are somehow confusing.
In the beginning you say that epprom value can be 0 - 255, then in the example when i reaches 256 you write that value into eeprom.
for (int i = 0; i < 512; i++)