Check this:
http://www.optrex.com/SiteImages/Par...AN20080104.pdf

Page 11, figure 7, I suggest the left schematic, unless you want to use the right schematic and deal with an external power supply.

Page 13, there's a nice wiring schematic.


And then this code for 51553 (similar, might work):
http://www.picbasic.co.uk/forum/showthread.php?t=3037

The 51553 uses a SED1565 controller and the 51852 uses a NJU6676 controller, but they are in the same family of Optrex graphic LCDs.

Good luck!


EDIT: It's important to know exactly which model of 51582 you have, not all of them have built-in power supply.