javascript - jQuery adding to css element -

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i have id of element. need add given value (determined variable in javascript) 1 of element's css attributes. i.e. given element id=my_id how add x element's margin-top attribute?

var x = 20; $('#my_id').css('margin-top', function(index, value) {     if (isnan(parseint(value)))         return x;      return parseint(value) + x });

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