The cursor positioning code in the library should do that 0x14 addressing for you. Have you tried this library: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1170601618/0#0
Its discussed in this thread: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1170601618/0#0
Most 4 line displays actually contain two driver chips and the panel manufacturers use subtly different ways of connecting them up. There are some suggestions in the discussion thread linked above that may help you get yours going.