setInterval(changeImg,timeInterval);
function changeImg()
{
    var obj=document.getElementById("obj");
    if (curIndex==arr.length-1)
    {
        curIndex=0;
    }
    else
    {
        curIndex+=1;
    }
    obj.src=arr[curIndex];
}
</script>

<img id=obj src="img/logo.gif" width=200 height=150 border=0>
可以自己配置，自己設(shè)置每張圖片切換的時(shí)間間隔，自己設(shè)置每張圖片的路徑（絕對(duì)、相對(duì)路徑都可以）雖然很簡單，但是很實(shí)用。

-------------------------------------------------------------

第二種方法:

//修改圖片的寬度、高度，注意要和下面的一樣，修改顯示位置
<style type="text/css">
#img1 {position:absolute; width:140px; height:105px; left:220px; top:125px; z-index:1; visibility:hidden;}
#img2 {position:absolute; width:140px; height:105px; left:220px; top:125px; z-index:2}
</style>

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var ie5=(document.getElementById && document.all);
var ns6=(document.getElementById && !document.all);

nPlus = 5   //the % of fading for each step
speed = 50 //速度

// You don't have to edit below this line
nOpac = 100
function FadeImg(){
    if(document.getElementById){
        document.getElementById('img1').style.visibility="visible";
        imgs = document.getElementById('img2');
opacity = nOpac+nPlus;
nOpac = opacity;
setTimeout('FadeImg()',speed);
    if(opacity>100 || opacity<0){
        nPlus=-nPlus;
    }
    if(ie5){
        imgs.style.filter="alpha(opacity=0)";
imgs.filters.alpha.opacity = opacity;
    }
    if(ns6){
        imgs.style.MozOpacity = 0 + '%';
imgs.style.MozOpacity = opacity + '%';
    }
}
}
onload=FadeImg;
// End -->
</script>
<div id="img1">
<img src="photos\1.jpg" border=0 width=140 height=105>
</div>
<div id="img2">
<img src="photos\2.jpg" border=0 width=140 height=105>
</div>