新窗口没能打开，帮忙看下代码，谢谢！
<!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 newwindow=confirm("是否打开新网页?");
if (newwindow==ture)
{
window.open('http://www.imooc.com','_blank','width=400,height=500',menubar=no,toolbar=no);
}
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>
