Quaternion CameraOrientation;
Quaternion UpRotation;
Quaternion DownRotation;
void Main()
{
    if (iInitializing())
    {
        
       iObjectOrientation(OBJ_0,CameraOrientation);
        
       iQuaternionFromEulerAngles(UpRotation,-2,0,0,"xyz");
       iQuaternionFromEulerAngles(DownRotation,2,0,0,"xyz");  

    }
    if (iKeyDown(iKeyCode("DIK_A")))
    {
       iQuaternionMultiply(CameraOrientation,CameraOrientation,UpRotation);
    }
    if (iKeyDown(iKeyCode("DIK_D")))
    {
        
       iQuaternionMultiply(CameraOrientation,CameraOrientation,DownRotation);
    }
    iObjectOrientationSet(OBJ_0,CameraOrientation);
}