css：使用Box-shadow弹出所选图像 –

img{border:solid 1px red; margin:10px;}
.selected{
   Box-shadow:0px 12px 22px 1px #333;
}

jQuery的：

$('img').click(function(){
   $('.selected').removeClass('selected'); // removes the prevIoUs selected class
   $(this).addClass('selected'); // adds the class to the clicked image
});

Fiddle