i have this
http://www.satistronics.com/myfiles/file/LCD/RT12864J-1.pdf
I tried this
http://www.arduino.cc/playground/Code/GLCDks0108
the lcd is not even switching on....
please if someone can help me i would appreciate to have something like:
pin 1 on the lcd = pin ??? on the mega
pin 2 on the lcd = pin ??? on the mega
.... and so on ....
thanks in advance 
I actually haven't used it on my mega but there is a header file in the library specifically for the mega,ks108_mega.h:
/*********************************************************/
/* Configuration for assigning LCD bits to Arduino Pins */
/*********************************************************/
/* Arduino pins used for Commands - these must be within the range of 30-37
*/
#define CSEL1 33 // CS1 Bit // swap pin assignments with CSEL2 if left/right image is reversed
#define CSEL2 34 // CS2 Bit
#define R_W 35 // R/W Bit
#define D_I 36 // D/I Bit
#define EN 37 // EN Bit
#define LCD_CMD_PORT PORTC // Command Output Register for pins 30-37
/* This version uses pins 22-29 for LCD Data */
/*******************************************************/
/* end of Arduino configuration */
/*******************************************************/
// these macros map pins to ports using the defines above
// the following should not be changed unless you really know what your doing
#define LCD_DATA_LOW_NBL A // port for low nibble: A=pins 22-25
#define LCD_DATA_HIGH_NBL A // port for high nibble: A=pins 26-29
// macros to fast write data to pins 30 - 37
#define fastWriteHigh(_pin) (PORTC |= 1 << ((7-(_pin -30)) & 0x07))
#define fastWriteLow(_pin) (PORTC &= ~(1 << ((7-(_pin -30)) & 0x07)))
#endif