i concur with sandraD, you will have to use a plain.
to do this
MAKE OBJECT PLAIN Object Number, Width, Height
TEXTURE OBJECT Object Number, Image Number
in your loop you will need
SET OBJECT TO CAMERA ORIENTATION Object Number
this will then face the same way as the camera so you will have to turn it
XROTATE OBJECT Object Number, 180
This hasnt been tested so i dont know if it will work or anything.
this will only put a plain in the 3d world and texture it you will have to worl out the collision yourself
Any spelling mistakes are totally In tensional.