哪里出错了呢？
<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
<title></title>
<script type="text/javascript">
function myMouseOver() {
document.getElementById('mouse').src="logo.gif";
}
function myMouseOut(){
document.getElementById('mouse').src="serchss.gif";
}
</script>
</head>
<body>
<a href="www.imooc.com"
onmouseover="myMouseOver()"
onmouseout="myMouseOut()">
<img src="logo.gif" id="mouse">
</a>
</body>
</html>
