看不出来我哪儿错了啊 求大神帮忙啊
<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=gbk"/>
<script type="text/javascript">
function openWindow()
{ var message=confirm("是否打开?");
if(message==true)
{ var mis=prompt("你确定要打开网站吗?","http//www.baidu.com");
if(mis!=null)
{window.open(mis,"_blank",'width=400px,height=500px,menubar=no,toolbar=no');}
else
{alert("再见");}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>