i need help with my alpha map

Hy,
I have a problem with my aplha map.
If I enable the recieve transparent shadow button there are little whit stars in my rendered picture.
Here the render
http://blenderartists.org/forum/images/attach/png.gif
and here the aplha map
http://blenderartists.org/forum/images/attach/jpg.gif

Ok i solved the problem.