为什么点击确定和取消都出来的是404错误界面呀，求指教
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>js常用的互动方法</title>
<script type="text/javascript">
function openWindow()
{var mymessage=confirm("是否打开新的界面");
if("mymessage==true"){
window.open('http：//baidu.com/','_blank','width=400','height=500','menusbar='no','toolbar='no');
}
else{document.write("已取消");}
}
</script>
</head>
<body>
<input name="button" type="button" onclick="openWindow()" value="点击进入慕课网" />
</body>
</html>
