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


You may go with this:

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

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

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