switch (sprite_index)
{
    case sItemMissile:
        scr_missile_create();
        break;
    case sItemSuperMissile:
        scr_supermissile_create();
        break;
    case sItemEnergyTank:
        scr_energytank_create();
        break;
    case sItemPowerBomb:
        scr_powerbomb_create();
        break;    
}