<style type="text/css">.hover {position:relative;}

.hover img {
  position:absolute;
  /* CSS3淡出淡入效果,1秒 */  -webkit-transition: opacity 1s ease-in-out;
  -moz-transition: opacity 1s ease-in-out;
  -o-transition: opacity 1s ease-in-out;
  transition: opacity 1s ease-in-out;
  width:500px;
}

.hover img:nth-of-type(2):hover{
  opacity:0; /*滑鼠滑入時，透明度變0*/}</style>
<div class="hover">
	<img src="/userUpload/images/Alanger/20151008_132123.jpg" /> <img src="/userUpload/images/Alanger/20151008_132307.jpg" /></div>
