Made main().

gba/tools/img2bin.py

@@ -19,9 +19,8 @@ def write_block(f, image, width=8, height=8, offset_x=0, offset_y=0):
     for x in range(width):
       val = image.getpixel((x+offset_x, y+offset_y)) 
       f.write(chr(val))
-  
-if __name__=="__main__":
 
+def main():
   tiled, args = gnu_getopt(sys.argv[1:], "t")
   
   if len(args) < 2:
@@ -53,3 +52,7 @@ if __name__=="__main__":
 
       value = (b << 10) + (g << 5) + r
       pal_output.write(struct.pack("<h", value))
+      
+  
+if __name__=="__main__":
+  main()