Can someone help me with my weapon?

I need a sword trail for my characters’ blades. I tried using an “Add Object” actuator with a plane, but it doesn’t look quite right. Wisemann’s script is perfect, but I just don’t understand it. Suggestions?

Characters:
http://freeuploader.com/view.php/104077.JPG
http://www.freeuploader.com/view.php/104079.JPG

(NOTE: only one of the male character’s weapons will be visible on screen at a time: one for his stance, one for his fighting)