If you use absolute positionning, you can add some CSS like that :
.div-clicked {
width: 289px !important ;
height: 289px !important ;
margin-top: 0 !important ;
margin-left: 0 !important ;
z-index: 400 ;
}
div {
transition: all 1s ; // To add transition effect
}
And then, with jQuery, you can toggle 'clicked' class simply by using :
$('div').on('click', function (e) { $(this).toggleClass('clicked') ; })
JSFiddle : http://jsfiddle.net/85QFN/