My game get slower and slower

[swedart]

My game gets slower and slower.
I can't find out why it’s slow down after every level.

Is there any kind person who can just look inside my game code.

The url is:
http://www.bamse.net/spel/preload_prisma.swf

I also attach the fla

Game info.
The user shall place items (mirrors) on the board to make the laser reach “the endlamp”