sorry in the script is another error

the line:

bmap = "menu_jpg" ;

must be:

bmap = menu_tga;

your tga is correct, this should work.

EDIT: set the layer from 1 to 10

the button-position (x,y) is the distance from
the point top-left from the paneln not from
the screen.

the button must be complete inside of the panel .

EDIT: thanks Richi007