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Вписывание цифры после отметки чекбокса


Dzen
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Добрый день,
Подскажите, пожалуйста как повесить обработчик на 2-ой чекбокс
var2,
чтобы при нажатии на него, в Поле ввода где переменная
znachenie вписывалась цифра 10?
И также при нажатии на + и – значение в поле
znachenie увеличивалось на 10 при нажатии на + или уменьшалось на 10 при нажатии на минус.
То есть два раза на + нажали, получили 20.
Можно пример?

<form><td align=center width=5%><input type=checkbox name=var1 value=><input type=checkbox name=var2 value=>+ | -</td><td align=center width=1%><input type=txt name=znachenie></input></td></form>
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