改进后的使用JS 动态切换图片的代码，可以在一个页面中重复使用。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" mrc="text/html; charset=utf-8" />
<title>JS切换图片（页面中可重复使用）</title>
<style type="text/css">
* { margin:0; padding:0; }
body { background:#FFF; color:#333; font:12px/1.6em Helvetica, Arial, sans-serif; }
h1, h2, h3, h4, h5, h6 { font-size:1em; }
a { color:#0287CA; text-decoration:none; }
a:hover { text-decoration:underline; }
ul, li { list-style:none; }
fieldset, img { border:none; }
legend { display:none; }
em, strong, cite, th { font-style:normal; font-weight:normal; }
input, textarea, select, button { font:12px Helvetica, Arial, sans-serif; }
table { border-collapse:collapse; }
html { overflow:-moz-scrollbars-vertical; }
.ibanner { position:relative; overflow:hidden; margin:20px 0 20px 300px; }
.ibanner_pic {}
.ibanner_pic a { position:absolute; top:0; display:block; overflow:hidden; }
.ibanner_btn { position:absolute; z-index:9999; right:5px; bottom:5px; font-weight:700; font-family:Arial; }
.ibanner_btn span { display:block; float:left; margin-left:4px; padding:0 5px; background:#000; cursor:pointer; }
.ibanner_btn .normal { height:20px; margin-top:8px; border:1px solid #999; color:#999; font-size:16px; line-height:20px; }
.ibanner_btn .current { height:28px; border:1px solid #FF5300; color:#FF5300; font-size:28px; line-height:28px; }
</style>
<script type="text/javascript">
function $(id) {
return document.getElementById(id);
}
function addLoadEvent(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
}
else {
window.onload = function () {
oldonload();
func();
}
}
}
function addBtn(ibannerIndex) {
if (!$('ibanner' + ibannerIndex) || !$('ibanner_pic' + ibannerIndex)) {
return;
}
var picList = $('ibanner_pic' + ibannerIndex).getElementsByTagName('a');
if (picList.length == 0) {
return;
}
var btnBox = document.createElement('div');
btnBox.setAttribute('id', 'ibanner_btn' + ibannerIndex);
btnBox.setAttribute('class', 'ibanner_btn');
var SpanBox = '';
for (var i = 1; i <= picList.length; i++) {
var spanList = '<span class="normal">' + i + '</span>';
SpanBox += spanList;
}
btnBox.innerHTML = SpanBox;
$('ibanner' + ibannerIndex).appendChild(btnBox);
$('ibanner_btn' + ibannerIndex).getElementsByTagName('span')[0].className = 'current';
for (var m = 0; m < picList.length; m++) {
var attributeValue = 'picLi_' + ibannerIndex + m;
picList[m].setAttribute('id', attributeValue);
}
}
function moveElement(elementID, final_x, final_y, interval) {
if (!document.getElementById) {
return false;
}
if (!document.getElementById(elementID)) {
return false;
}
var elem = document.getElementById(elementID);
if (elem.movement) {
clearTimeout(elem.movement);
}
if (!elem.style.left) {
elem.style.left = "0px";
}
if (!elem.style.top) {
elem.style.top = "0px";
}
var xpos = parseInt(elem.style.left);
var ypos = parseInt(elem.style.top);
if (xpos == final_x && ypos == final_y) {
moveing = false;
return true;
}
if (xpos < final_x) {
var dist = Math.ceil((final_x - xpos) / 10);
xpos = xpos + dist;
}
if (xpos > final_x) {
var dist = Math.ceil((xpos - final_x) / 10);
xpos = xpos - dist;
}
if (ypos < final_y) {
var dist = Math.ceil((final_y - ypos) / 10);
ypos = ypos + dist;
}
if (ypos > final_y) {
var dist = Math.ceil((ypos - final_y) / 10);
ypos = ypos - dist;
}
elem.style.left = xpos + "px";
elem.style.top = ypos + "px";
var repeat = "moveElement('" + elementID + "'," + final_x + "," + final_y + "," + interval + ")";
elem.movement = setTimeout(repeat, interval);
}
function classNormal(ibannerIndex) {
var btnList = $('ibanner_btn' + ibannerIndex).getElementsByTagName('span');
for (var i = 0; i < btnList.length; i++) {
btnList[i].className = 'normal';
}
}
function picZ(ibannerIndex) {
var picList = $('ibanner_pic' + ibannerIndex).getElementsByTagName('a');
for (var i = 0; i < picList.length; i++) {
picList[i].style.zIndex = '1';
}
}
var autoKey = false;
function iBanner(ibannerIndex) {
if (!$('ibanner' + ibannerIndex) || !$('ibanner_pic' + ibannerIndex) || !$('ibanner_btn' + ibannerIndex)) {
return;
}
$('ibanner' + ibannerIndex).onmouseover = function () {
autoKey = true;
};
$('ibanner' + ibannerIndex).onmouseout = function () {
autoKey = false;
};
var btnList = $('ibanner_btn' + ibannerIndex).getElementsByTagName('span');
var picList = $('ibanner_pic' + ibannerIndex).getElementsByTagName('a');
if (picList.length == 1) {
return;
}
picList[0].style.zIndex = '2';
for (var m = 0; m < btnList.length; m++) {
btnList[m].onmouseover = function () {
for (var n = 0; n < btnList.length; n++) {
if (btnList[n].className == 'current') {
var currentNum = n;
}
}
classNormal(ibannerIndex);
picZ(ibannerIndex);
this.className = 'current';
picList[currentNum].style.zIndex = '2';
var z = this.childNodes[0].nodeValue - 1;
picList[z].style.zIndex = '3';
if (currentNum != z) {
picList[z].style.left = '650px';
moveElement('picLi_' + ibannerIndex + z, 0, 0, 10);
}
}
}
}
function autoBanner(ibannerIndex) {
if (!$('ibanner' + ibannerIndex) || !$('ibanner_pic' + ibannerIndex) || !$('ibanner_btn' + ibannerIndex) || autoKey) {
return;
}
var btnList = $('ibanner_btn' + ibannerIndex).getElementsByTagName('span');
var picList = $('ibanner_pic' + ibannerIndex).getElementsByTagName('a');
if (picList.length == 1) {
return;
}
for (var i = 0; i < btnList.length; i++) {
if (btnList[i].className == 'current') {
var currentNum = i;
}
}
if (currentNum == (picList.length - 1)) {
classNormal(ibannerIndex);
picZ(ibannerIndex);
btnList[0].className = 'current';
picList[currentNum].style.zIndex = '2';
picList[0].style.zIndex = '3';
picList[0].style.left = '650px';
moveElement('picLi_' + ibannerIndex + '0', 0, 0, 10);
}
else {
classNormal(ibannerIndex);
picZ(ibannerIndex);
var nextNum = currentNum + 1;
btnList[nextNum].className = 'current';
picList[currentNum].style.zIndex = '2';
picList[nextNum].style.zIndex = '3';
picList[nextNum].style.left = '650px';
moveElement('picLi_' + ibannerIndex + nextNum, 0, 0, 10);
}
}
function bannerInit() {
addBtn('1');
iBanner('1');
setInterval('autoBanner("1")', 2000);
addBtn('2');
iBanner('2');
setInterval('autoBanner("2")', 3000);
}
addLoadEvent(bannerInit);
</script>
</head>
<body>
<div class="ibanner" style="width:650px; height:250px;" id="ibanner1">
<div class="ibanner_pic" id="ibanner_pic1">
<a href="/jscss/"><img style="width:650px; height:250px;" src="http://p1.mb5u.com/texiao/1/20110225160443156.jpg" alt="" /></a>
<a href="/jscss/"><img style="width:650px; height:250px;" src="http://p1.mb5u.com/texiao/1/20110225160443157.jpg" alt="" /></a>
<a href="/jscss/"><img style="width:650px; height:250px;" src="http://p1.mb5u.com/texiao/1/20110225160443158.jpg" alt="" /></a>
<a href="/jscss/"><img style="width:650px; height:250px;" src="http://p1.mb5u.com/texiao/1/20110225160443159.jpg" alt="" /></a>
</div>
</div><!--ibanner end-->
<div style="height:20px; background:#EEE;"></div>
<div class="ibanner" style="width:350px; height:125px;" id="ibanner2">
<div class="ibanner_pic" id="ibanner_pic2">
<a href="/jscss/"><img style="width:350px; height:125px;" src="http://p1.mb5u.com/texiao/1/20110225160443156.jpg" alt="" /></a>
<a href="/jscss/"><img style="width:350px; height:125px;" src="http://p1.mb5u.com/texiao/1/20110225160443157.jpg" alt="" /></a>
<a href="/jscss/"><img style="width:350px; height:125px;" src="http://p1.mb5u.com/texiao/1/20110225160443158.jpg" alt="" /></a>
<a href="/jscss/"><img style="width:350px; height:125px;" src="http://p1.mb5u.com/texiao/1/20110225160443159.jpg" alt="" /></a>
<a href="/jscss/"><img style="width:350px; height:125px;" src="http://p1.mb5u.com/texiao/1/20110225160443157.jpg" alt="" /></a>
</div>
</div>
</body>
</html>