i have to use a pic 16f84a to make a program like the game simon says leds 1 - 4 light up in a random order the you enter the squence back to it but i im have problems using the button comand

can any help me


b5=0
L2:
button 7,0,0,4,B5,1,L4
L4:
IF PIN7 = 0 THEN LO


LO:
high 3
PAUSE 1000
LOW 3
goto L2