An arrangement comprising a first window shade (105, 115) and a first motorized mechanism for operating the first window shade (105, 115), the first window shade including a fixed end (210, 310) and a free end (211, 311) movable between a retracted position and an extended position, wherein the first motorized mechanism comprises: first motorized rotational motion generating means (402, 404), disposed proximate to the fixed end of the first window shade, for generating rotational motion; first converting means (208, 306) for converting the rotational motion of the first rotational motion generating means to linear motion between the retracted position and the extended position; second converting means (702, 704)for converting the linear motion of the first converting means to rotational motion; third converting means (206, 308) for converting the rotational motion of the second converting means to linear motion between the retracted position and the extended position; and means for coupling the free end of the first window shade to the first and third converting means so that the first window shade is operated with operation of the rotational motion generating means to move the free end of the first window shade between the retracted position and the extended position, characterized in that the arrangement further comprises a second window shade and a second motorized mechanism, the second window shade including a fixed end and a free end movable between a retracted position and an extended position, wherein the second motorized mechanism comprises: second motorized rotational motion generating means, disposed proximate to the fixed end of the second window shade, for generating rotational motion; fourth converting means for converting the rotational motion of the second rotational motion generating means to linear motion between the retracted position and the extended position; fifth converting means for converting the linear motion of the fourth converting means to rotational motion; sixth converting means for converting the rotational motion of the fifth converting means to linear motion between the retracted position and the extended position; and means for coupling the free end of the second window shade to the fourth and sixth converting means so that the second window shade is operated with operation of the second rotational motion generating means to move the free end of the second window shade between the retracted position and the extended position, wherein the second converting means of the first motorized mechanism comprises an inner axle and the fifth converting means of the second motorized mechanism comprises an outer axle, wherein the inner axle is mounted within the outer axle. first motorized rotational motion generating means (402, 404), disposed proximate to the fixed end of the first window shade, for generating rotational motion; first converting means (208, 306) for converting the rotational motion of the first rotational motion generating means to linear motion between the retracted position and the extended position; second converting means (702, 704)for converting the linear motion of the first converting means to rotational motion; third converting means (206, 308) for converting the rotational motion of the second converting means to linear motion between the retracted position and the extended position; and a second window shade and a second motorized mechanism, the second window shade including a fixed end and a free end movable between a retracted position and an extended position, wherein the second motorized mechanism comprises: second motorized rotational motion generating means, disposed proximate to the fixed end of the second window shade, for generating rotational motion; fourth converting means for converting the rotational motion of the second rotational motion generating means to linear motion between the retracted position and the extended position; fifth converting means for converting the linear motion of the fourth converting means to rotational motion; sixth converting means for converting the rotational motion of the fifth converting means to linear motion between the retracted position and the extended position; and second motorized rotational motion generating means, disposed proximate to the fixed end of the second window shade, for generating rotational motion; fourth converting means for converting the rotational motion of the second rotational motion generating means to linear motion between the retracted position and the extended position; fifth converting means for converting the linear motion of the fourth converting means to rotational motion; sixth converting means for converting the rotational motion of the fifth converting means to linear motion between the retracted position and the extended position; and