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about the use of button

• To: mathgroup at smc.vnet.net
• Subject: [mg115015] about the use of button
• From: yang <sun.lanyang at gmail.com>
• Date: Tue, 28 Dec 2010 06:51:17 -0500 (EST)

Hello, I'm a novice in Mathematica, now got a little puzzeled:

I'm intend to create a button which take two actions while clicked:

Button["A person enters",
{Dynamic[car_weight+=60],Dynamic[person_number++}]]

seems that this sentence won't work properly, 

There must be some error with the grammar, right?