<HTML>
<HEAD>
<TITLE>页面背景篇--背景向下移动</TITLE>
</HEAD>
<!-- [Step1]: 这里可以更改背景的图形名称 -->
<BODY bgcolor="#fef4d2" background="Picture003.gif" >
<br><br>
<center>
<font color="ffaafa"><h2>页面背景篇--背景向下移动</h2></font>
<hr width=300>
<br><br>
<!-- 案例代码开始 -->
<script language=JavaScript>
var index = 0;
function scrollBG(maxSize) {
index = index + 2;
if (index > maxSize) index = 0;
eval('document.body').style.backgroundPosition = "0 " + index;
}
<!-- [Step2]: 在此能够设置移动的速度 -->
window.setInterval("scrollBG(300)", 50);
</script>
<!-- 案例代码结束 -->
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE>页面背景篇--背景图形</TITLE>
</HEAD>
<BODY bgcolor="#fef4d2" >
<br><br>
<center>
<font color="ffaafa"><h2>页面背景篇--背景图形</h2></font>
<hr width=300>
<br><br>
<!-- 案例代码开始 -->
<script language=JavaScript>
image_directory = "";
clear = new Image(); clear.src = image_directory + "";
pic1 = new Image(); pic1.src = image_directory + "Picture001.jpg";
pic2 = new Image(); pic2.src = image_directory + "Picture003.gif";
pic3 = new Image(); pic3.src = image_directory + "Picture002.jpg";
function imagechange(imgName) {
document.body.background = eval(imgName + ".src");