How do you beat level 1 on causality

There are 7 guys to kill:
1) First, click the guy on the roof (left). He falls off.
2) Then the post on the right side of the roof. (falls and kills guy).
3) When one guy leaves to go up the elevator, click on the computer screen watched by the guy on the right. It will go off and he will go left and lean on the elevator button.
4) When the man who enters the elevator goes into the top room and starts to talk, click on his word balloon. He will drops his papers on the floor and leave.
5) When the guy returns from the 2nd floor, the other guy will fall into the elevator, Click the cable and it breaks and both fall to their deaths.
6) Click the light fixture to drop it on the two talking guys.
7) Click the picture frame in the guy's office. He will get up to adjust it, slip on the papers, and hits his head on the desk.
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Expanded version:

• Click on the stickman on the top of the building on the left side, and he will fall to his death. Then, click on the stick near the stickman to the right, and it will stab him.
• There will be a man on the bottom floor that will walk into the elevator to talk to the man at his desk, sleeping. As he is talking, click on his word bubble, and he will drop his pages. Before he gets on the elevator, click on the button that looks green that is above it, and it will turn red. This will delay the elevator for a while.
• Go and click 4 times on the computer of the man at the desk below, and it will flash red and break. He will get frustrated and walk away, and go to lean against the elevator doors. Press the red button over the elevator to make it green, and let the man get on the elevator. As soon as it goes down and the man that was leaning against the door falls in, quickly click the rope holding the elevator and it will break, causing both stickmen to fall.
• Click on the light above both of the conversing stickmen, and it will fall and kill both of them.
• Tilt the picture frame of the remaining stickman, causing it to tilt, and he will walk over towards it, but fail and slip (on the papers) in the attempt, hitting his head against the edge of the table.