XHTML中按鈕添加超連結以及使插入圖片與螢幕一樣大，
1、按鈕添加超連結
(1)如果是在本頁跳轉到新頁面，用
<span style="font-size:18px;"><input type="button" onclick="window.location.href('連結地址')" /></span>
<span style="font-size:18px;"><input type="button" onclick="window.open('連結地址')" /></span>2、
插入圖片使得圖片與螢幕一樣大
用定位的方式實現
<body><span style="white-space:pre"></span><div style="position:absolute; z-index:-1; width:100%; height:100%"><img src="圖片路徑及名稱" width="100%" height="100%" /></div></body>其中：position：absolute ，絕對位置
z-index： -1 設定元素的堆疊順序，數值小的在底層，數值大的在表層。-1相當於背景。
width，height：100% ，針對於瀏覽器的大小，無論什麼瀏覽器，大小都是100%
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