well you could make some kind of animated hud and when you press a button it appears on the screen, well i mean assuming your using a keypad. but if you only wanted a picture of a key pad and to enter the buttons and nothing happens to the keypad, try this
;Artificial Intelligence Script
;Header
desc = keypad template
;Triggers
:state=0,plrdistwithin=40:hudreset,hudx=50,hudy=80,hudimagefine=(enter picture of keypad here),state=1
:state=1,scancodekeypressed=(enter scan key number):state=2
:state=2,scancodekeypressed=(enter scan key number):state=3
:state=3,scancodekeypressed=(enter scan key number):state=4
:state=5,scancodekeypressed=(enter scan key number):activateifused=1
;End of Script
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