<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
function change(){
var sw=window.screen.width
var sh=window.screen.height
window.open('http://www.google.com','newWin1','width='+sw/2+',height='+sh+',screenX=0,screenY=0')
window.open('http://www.baidu.com','newWin2','width='+sw/2+',height='+sh+',screenX='+sw/2+',screenY=0')
}
</script>
</head>
<body>
<a href="###" onclick="change()">ddddd</a>
</body>
</html>
<html><head>
<title>CSS简单网页</title>
<style>
#box{width:500pxheight:500pxposition:relativelytop:50%left:50%margin-top:-250pxleft:-250pxbackground:#f00color:#fff}
</style>
</head>
<body>
<div id="box">这是一个简单的水平,垂直居中的盒子</div>
</body>
</html>