/// set_default_keys()
global.opkeybtn_up = 38;
global.opkeybtn_down = 40;
global.opkeybtn_left = 37;
global.opkeybtn_right = 39;
global.opkeybtn_a = 90;
global.opkeybtn_b = 88;
global.opkeybtn_x = 17;
global.opkeybtn_l = 16;
global.opkeybtn_l2 = 67;
global.opkeybtn_r = 65;
global.opkeybtn_r2 = 32;
global.opkeybtn_select = 83;
global.opkeybtn_start = 13;
global.opkeybtn_exit = 27;
global.opkeybtn_menu1 = 90;
global.opkeybtn_menu2 = 88;
