rotate around point

How do I rotate an object around a point on the screen.
Say I have an object at centre 200,200 and I want rotate around point 100,100.

How do I do this?

obj1 = display.newImage(“frontwheel.png”)
obj1.x=200
obj2.y=200

obj1.rotation=30 – around point 100,100? [import]uid: 138547 topic_id: 26321 reply_id: 326321[/import]

If I can rotate images around a point I could make this game.

http://www.playedonline.com/game/598420/rotate-roll.html

PhysicsEditor doesnt handle a single shape with many parts as these images seem to be created as 1 image. [import]uid: 138547 topic_id: 26321 reply_id: 106777[/import]