There is a lot of discussion on this forum about this function pointing to 0x0000. It restarts your code but it won't reset all registers and internal counters. If you search for "reset function" (upper right) you find several threads e.g. - http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1235780325
That said, as long as it works for your sketches ...