Drag movie control

can u tell me how can i make the flash stops at one point and by himself starts returing back or that when someone drags the mouse at one point the flash stopts him and he can only go backward, this flash goes around in a circle you can say, but i need the same but that it stops at like one point of da pic and that u can go only back, u know that it has a limit at start and in the end…thank you a lot

here is the similar thing:
http://www.stress.hr/stress3d/eksterijer.swf