Thanks a lot, I've fixed it now. But I think there's a flaw in compiler. Any normal compiler, when see "RETURN" command without GOSUB, should pop up an error "RETURN without GOSUB"

I have another question. From PBP examples, I've learned how to interact with multiple buttons. But how to set "action" running only when button is being pressed and hold?

This is an example code:

Code:
chk1:
PAUSE 25  ' Pause once for each loop
' Check Button 1 (Skip to 2 if Not Pressed)
BUTTON FOCLBN, 0, 40, 5, B1, 0, chk2
TOGGLE LED1 ' Toggle LED if pressed
chk2:
' Check Button 2 (Skip to 1 if Not Pressed)
BUTTON FOCRBN, 0, 40, 5, B2, 0, chk1 
TOGGLE LED2 ' Toggle LED if pressed
GOTO CHK1 

END
here the TOGGLE command toggles the status of the led. So instead of toggle, I can use HIGH LED1, HIGH LED2? but what will make LEDs low, when buttons aren't pressed?