thanks a lot!

okay, but when i click on File -> Export -> Export Image -> PNG, then i have only 3 options:
8 bit
24 bit
24 bit with alpa channel

so which one i should select?

hi, i'm new on this forum and i want to ask something. i have a problem. I've painted in MX flash 08 this -> http://img110.imageshack.us/my.php?image=loolololololmy2.png hand. as you can see, behind this hand is a white background, and this is my problem. i want to erase that white background, but i...