spinning a cube properly

i have a cube i want to spin 90 degrees at a time with key presses.
here is the code i have:

Global gameFPS = 50
Global turning=False,spin,rt#,yw#,direction
Graphics3D 800,600
cam = CreateCamera ()
PositionEntity cam,10,10,10
CameraViewport cam, 0, 0, GraphicsWidth (), GraphicsHeight ()
light=CreateLight()
PositionEntity light,10,10,10
Global mainbox=CreateCube()
PointEntity cam,mainbox
framePeriod = 1000 / gameFPS
frameTime = MilliSecs () - framePeriod
Repeat
	Repeat
		frameElapsed = MilliSecs () - frameTime
	Until frameElapsed
	frameTicks = frameElapsed / framePeriod
	frameTween# = Float (frameElapsed Mod framePeriod) / Float (framePeriod)
	
	For frameLimit = 1 To frameTicks
		If frameLimit = frameTicks Then CaptureWorld
		frameTime = frameTime + framePeriod
		UpdateGame ()
 		UpdateWorld
	Next
	RenderWorld frameTween
	Text 0,0,rt#+"  "+spin+"  "+turning
	Flip
Until KeyHit (1)
End

Function UpdateGame ()
	keypress()
	rotatemain()
End Function

Function keypress()
If Not turning
 	If KeyHit(203)
		turning=True
		spin=0
		direction=1
	ElseIf KeyHit(205)
		turning=True
		spin=0
		direction=2
	ElseIf KeyHit(200)
		turning=True
		spin=0
		direction=3
	ElseIf KeyHit(208)
		turning=True
		spin=0
		direction=4
	EndIf
EndIf
End Function


Function rotatemain()
If turning
	spin=spin+1
	RotateEntity mainbox,rt#,0,yw#
	If direction =1 Then rt#=rt#-9
	If direction =2 Then rt#=rt#+9
	If direction =3 Then yw#=yw#+9
	If direction =4 Then yw#=yw#-9
	If spin = 10
		turning=False
		Return
	EndIf
EndIf
End Function

what am i doing wrong here? the cube isnt seating into its correct position after 90 degrees

If turning
	spin=spin+1
	If direction =1 Then rt#=rt#-9
	If direction =2 Then rt#=rt#+9
	If direction =3 Then yw#=yw#+9
	If direction =4 Then yw#=yw#-9
	RotateEntity mainbox,rt#,0,yw#
	If spin = 10
		turning=False
		Return
	EndIf
EndIf

big thanks.

No probs :-)