alpha on rectangles

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Picklesworth

okay, I tried using a sprite, but I can't get it working right. The sprite is not visible

;create the camera
Global camPointer = CreatePivot()
PositionEntity camPointer,640,72,1895
TurnEntity campointer,0,-135,0,True

;campointerY = TerrainHeight#(terrain,EntityX(Campointer),EntityZ(CamPointer)) * 128
;PositionEntity camPointer,500,campointerY,700

Global cam = CreateCamera(camPointer)
MoveEntity cam,0,80,-100
CameraFogMode cam,1
CameraFogColor cam,150,150,150
CameraFogRange cam,300,1024

;the sprite for the background of the buttons
buttonbg = createsprite(cam)
scalesprite buttonbg,graphicswidth() - 20,130
entitycolor buttonbg,0,0,0
positionentity buttonbg,entityx(cam),entityy(cam),entityz(cam)
;pointentity buttonbg,campointer
moveentity buttonbg,0,0,2
;note that I've tried many distances for this, up to 10.

What am I doing wrong?