Reply to Libling,

The UDB blog allows you to modify source codes, which make it better than other blogs.

Originally I want to make this flashing stars appear near the background tree (In California 17-miles drive), But I don't know how to move these stars to the places where I want them to be.

好利害.........I came to UDN almost 2 years, dunno how to do it...

Awesome !!

Libling :)