[silin]

/* constructor for Tween class

obj: reference - the object which the Tween targets
prop: string - name of the property (in obj) that will be affected
begin: number - the starting value of prop
duration: number - the length of time of the motion; set to infinity if negative or omitted
useSeconds: boolean - a flag specifying whether to use seconds instead of frames
*/
function Tween (obj, prop, func, begin, finish, duration, useSeconds)