javascript - Trying to change 'margin-top' attribute -

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This is what I am trying to do: 

  $ (function ( ) {$ ('Div.item'). CSS ('margin-top', - (closest ('IMG'). Altitude ()) / 2 + 'px';});   
 me  ' style = "margin-top: XXXXXX; top: 50%" to get  where  'XXXXXX'  is equal to  (('div. Item an img '). Height ()) / 2   
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