The script should look like this :-

import poser<br></br><br></br>scene = poser.Scene()<br></br>fig = scene.CurrentFigure()<br></br>if fig != None:<br></br>    for act in fig.Actors():<br></br>        act.SetCastsShadows(0)<br></br>

The spaces are important, so to be on the safe side, right click on the link and save as an appropriately named file.