请问我那里写的不对
<!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 net=confirm("确定打开新窗口吗?");
if (net==ture){
window.open('http://www.imooc.com','_blank','height=500px','width=400px','menubar=no','toolbar=no');
}
else
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>