#define PRESSED(%0) \
    (((newkeys & (%0)) == (%0)) && ((oldkeys & (%0)) != (%0)))



public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    new engine,lights,alarm,doors,bonnet,boot,objective;
    if(PRESSED( KEY_JUMP ))
    {
        if(IsPlayerInAnyVehicle(playerid))
        {
            new vid = GetPlayerVehicleID(playerid);
            new getcar = GetCar(vid,1);
            if(Vehicle[getcar][vEngine] == 0)
            {
                GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
                SetVehicleParamsEx(vid,VEHICLE_PARAMS_ON,1,alarm,doors,bonnet,boot,objective);
                Vehicle[getcar][vEngine] = 1;
            }
            else if(Vehicle[getcar][vEngine] == 1)
            {
                GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
                SetVehicleParamsEx(vid,VEHICLE_PARAMS_OFF,1,alarm,doors,bonnet,boot,objective);
                Vehicle[getcar][vEngine] = 0;
            }
        }
    }
    return 1;
}