实现两张图片切换，为什么下面这段代码实现不了，有没有更好的办法
<head>
<title></title>
<script type="text/javascript" language="javascript">
function chgImg(){
var current_id = 0;
var the_img=window.document.getElementById("myImg");
the_img.src ="images/pic1.jpg";
current_id++;
setTimeout("the_img.src = images/pic2.jpg",1000);
}
}
setInterval("chgImg()",1000);
</script>
</head>
<body onload="chgImg()">
<div>
<img src="images/pic1.jpg" alt="" id="myImg" />
</div>
</body>
[解决办法]
<!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" content="text/html; charset=utf-8" /><title>无标题文档</title><script type="text/javascript">function chgImg() { var o = document.getElementById('myImg'); var src = o.src; o.src = o.getAttribute('src2'); o.setAttribute('src2', src);}window.onload = function() { window.setInterval('chgImg()', 1000);}</script></head><body><img src="images/pic1.jpg" src2="images/pic2.jpg" id="myImg" /></body></html>