<div id="Layer1" style="position:absolute; width:200px; height:115px; z-index:1;">aaaa</div>
<script language="JavaScript" type="text/JavaScript">
Layer1.style.top = screen.height * 0.3;
Layer1.style.left = screen.width * 0.3;
</script>
<script language="JavaScript" type="text/JavaScript">
Layer1.style.top = screen.height * 0.3;
Layer1.style.left = screen.width * 0.3;
</script>
<body><SCRIPT LANGUAGE="JavaScript">
var s = "网页可见区域宽："+ document.body.clientWidth;
s += "\r\n网页可见区域高："+ document.body.clientHeight;
s += "\r\n网页正文全文宽："+ document.body.scrollWidth;
s += "\r\n网页正文全文高："+ document.body.scrollHeight;
s += "\r\n网页正文部分上："+ window.screenTop;
s += "\r\n网页正文部分左："+ window.screenLeft;
s += "\r\n屏幕分辨率的高："+ window.screen.height;
s += "\r\n屏幕分辨率的宽："+ window.screen.width;
s += "\r\n屏幕可用工作区高度："+ window.screen.availHeight;
s += "\r\n屏幕可用工作区宽度："+ window.screen.availWidth;
alert(s);
</SCRIPT>
</body>
<HTML>
<script>
function divcenter(){
document.all.mxh.style.left=(Math.round((document.body.scrollWidth-200)/2)).toString()+"px"
}
</script>
<body onload="divcenter()" onresize=divcenter()>
<table width=100%>
<tr>
<td>test
</td>
</tr>
</table>
<div id=mxh style="position:absolute;left:200px;top:30px;width:200px;height:200px;background-color:navy;border:2px;color:#FFFFFF">测试文字</div>
</HTML>