[Solved] I want increase my div height dynamically 20 px each time I press a button

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You may go with this:

$('#myButton').click(function(){
    $('.wizard .content').css({ 'min-height' : '+=20px' });
});

Demo: http://jsfiddle.net/hoss/xtUPC/

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solved I want increase my div height dynamically 20 px each time I press a button