I guess the easy way to make a poster inside Poser is to: 1. Use a one sided square (sized) for poster. 2. Assign a material name to it. 3. Use 4 smaller one sided squares (sized and angled). 4. Position them in the corners and offset them a teensy bit. 5. Assign a material name (the same) to the 4 squares/oblongs. 6. Export as one obj. 7. Import the object. 8. Apply pic to material assigned to poster. 9. Adjust transparacey settings for material assigned to the tape squares.

"You don't have to be mad to use Poser... but it helps"