求大神知道如何解决这段代码的bug
我div的节点会出现收不回去的bug，而且还会来回运动
<!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>
<style type="text/css">
div,span,body{
margin:0px;
padding:0px;
}
#div1{width:200px;height:200px;background:#03F;position:relative;left:-200px;top:0px}
#div1 span{width:20px;height:50px;background:#CCC;position:absolute;left:200px;top:75px}
</style>
<script type="text/javascript">
window.onload=function(){
var D=document.getElementById("div1");
D.onmouseover=function(){
M(0);
}
D.onmouseout=function(){
M(-200);
}
function M(T){
var D=document.getElementById("div1");
var timer=null;
clearInterval(timer);
timer =setInterval(function(){
var s=0;
if(T>D.offsetLeft){
s=10;
}
else{
s=-10;
}
if(T==D.offsetLeft){
clearInterval(timer);
}
else{
D.style.left=D.offsetLeft+s+"px";
}
},30)
}
}
</script>
</head>
<body>
<div id="div1"><span></span><div>
</body>
</html>
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