I solved the problem.

The problem was caused because there is a bug with WED (a7).

I entered "an_image.bmp" into the player's string1 and built the level, but WED didn't save the string1.

So i tried to write the line below in the player's action:

my.string1="an_image.bmp";

and now everything is ok!

Thank you guys.

I don't care!