Leaving charger plugged in after battery full 100%

I often accidentally leave my macbook Pro plugged in after it is fully charged, or from time to time I've left it accidentally plugged in all night.  What is this doing to my battery life? I get really worried when it happens. Is there any way of automatically stopping the power flow after the battery is fully charged?

Charging automatically stops when the battery is fully charged, and doesn't start again until the battery's charge level falls below 93% even if the adapter remains connected. You can't do your battery any harm by leaving your AC adapter connected whenever it's convenient, as long as you calibrate the battery from time to time: once a month if the battery is never used to power the computer, or every 2-3 months if you do use the battery regularly.
http://support.apple.com/kb/HT1490
In short, stop worrying.

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