图片轮回显示效果

下面为效果显示

脚本说明:
第一步：把如下代码加入<body>区域中
<script language=javaScript>
var i_strngth=1
var i_image=0
var imageurl = new Array()
imageurl[0] ="1840.gif"
imageurl[1] ="1841.gif"
imageurl[2] ="1842.gif"
function showimage() {
if(document.all) {
if (i_strngth<=110) {
testimage.innerHTML="<img style='filter:alpha(opacity="+i_strngth+")' src="+imageurl[i_image]+" border=0>";
i_strngth=i_strngth+10
var timer=setTimeout("showimage()",100)}
else {
clearTimeout(timer)
var timer=setTimeout("hideimage()",1000)}}
if(document.layers){
clearTimeout(timer)
document.testimage.document.write("<img src="+imageurl[i_image]+" border=0>")
document.close()
i_image++
if (i_image >= imageurl.length) {i_image=0}
var timer=setTimeout("showimage()",2000)}}
function hideimage() {
if (i_strngth >=-10) {
testimage.innerHTML="<img style='filter:alpha(opacity="+i_strngth+")' src="+imageurl[i_image]+" border=0>";
i_strngth=i_strngth-10
var timer=setTimeout("hideimage()",100)}
else {
clearTimeout(timer)
i_image++
if (i_image >= imageurl.length) {i_image=0}
i_strngth=1
var timer=setTimeout("showimage()",500)}}
</script>
<div id="testimage" style="position:absolute;visibility:visible;top:120px;left:240px"></div>

第二步：把<body>中的内容改为：
<body bgcolor="#fef4d9" onLoad="showimage()">