延遲圖片加載 - Lazy loader

只下載當前螢幕的圖片，如果將頁面往下拉才會加載並淡出圖片

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript" src="https://dl.dropboxusercontent.com/u/20523662/js/lazyload.mini.js
"></script>