String   fret   note   

E        1      F
         2      F#
         3      G
         4      G#
         5      A
         6      A#
         7      B
         8      C
         9      C#
         10     D
         11     D#
         12     E

A        1      A#
         2      B
         3      C
         4      C#
         5      D
         6      D#
         7      E
         8      F
         9      F#
         10     G
         11     G#
         12     A

D        1      D#
         2      E
         3      F
         4      F#
         5      G
         6      G#
         7      A
         8      A#
         9      B
         10     C
         11     C#
         12     D

G        1      G#
         2      A
         3      A#
         4      B
         5      C
         6      C#
         7      D
         8      D#
         9      E
         10     F
         11     F#
         12     G


after the 12 every note repeats it self..think of the 12 as open 
and 13 as the first fret