请帮我看看，谢谢
<!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>5-5</title>
<style type="text/css">
* {
margin:0;
padding:0;
}
#div1 {
background:#C03;
width:200px;
height:200px;
position:relative;
left:-200px;
top:0;
}
#div1 span {
background:#00C;
width:20px;
height:50px;
position:absolute;
top:75px;
left:200px;
color:#333;
}
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById('div1');
oDiv.onmouseover=function(){
startmove();
}
}
var timer;
function startmove(){
timer.setInterval(function(){
if(oDiv.offsetLeft==0){
clearInterval(timer);
}
else{
var oDiv=document.getElementById('div1');
oDiv.style.left=oDiv.offsetLeft+10+"px";
}
},30)
}
</script>
</head>
<body>
<div id="div1"><span class="share">分享</span></div>
</body>
</html>
