global.tank_allied_sprite=sprite_add(working_directory+'/gfx/sprites/tank_allied.jpg',1,0,0,0,0,0,0);
if !sprite_exists(global.tank_allied_sprite) sprite_index=global.tank_allied_sprite
Oczywiście zmienna global.tank_allied_sprite musi być zadeklarowana. Tzn. w create daj np. global.tank_allied_sprite = 0;