Problem with glutMotionFunc(MotionCallback)

When I rotate qx (move cursor on the x axis of the window) the camera do not rotate on the z axis of the camera, Dir is the direction of view camera.


	glutMouseFunc(MouseCallback);
	glutMotionFunc(MotionCallback);
	MotionCallback(0, 0);

void Simulation::MouseCallback(int button, int state, int x, int y)
{
	mx = x;
	my = y;
}

void Simulation::MotionCallback(int x, int y)
{
	int dx = mx - x;
	int dy = my - y;
	
	Dir.normalize();
	N.cross(Dir,NxVec3(0,1,0));

	NxQuat qx(NxPiF32 * dx * 20/ 180.0f, NxVec3(0,1,0));
	qx.rotate(Dir);
	NxQuat qy(NxPiF32 * dy * 20/ 180.0f, N);
	qy.rotate(Dir);

	mx = x;
	my = y;
}

[Video of motionCallback problem of GLUT](http://www.roboime.com.br/svn/RoboCup/Projeto Computacional/Videos/Animation.avi)

NxQuat is a quaternion class