Javascript获取屏幕与页面尺寸

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page </title>
<script type="text/javascript">
function checkValue(){
debug.innerText="网页可见区域宽:document.body.clientWidth.....:"+document.body.clientWidth+"\n"+
"网页可见区域高:document.body.clientHeight.....:"+document.body.clientHeight+"\n"+
"网页可见区域高:document.body.offsetWidth.....:"+document.body.offsetWidth+"\n"+
"网页可见区域高:document.body.offsetHeight.....:"+document.body.offsetHeight+"\n"+
"网页正文全文宽:document.body.scrollTop.....:"+document.body.scrollTop+"\n"+
"网页正文全文高:document.body.scrollLeft.....:"+document.body.scrollLeft+"\n"+
"网页被卷去的高:window.screenTop.....:"+window.screenTop+"\n"+
"网页被卷去的左:window.screenLeft.....:"+window.screenLeft+"\n"+
"屏幕分辨率的高:window.screen.height.....:"+window.screen.height+"\n"+
"屏幕分辨率的宽:window.screen.width.....:"+window.screen.width+"\n"+
"屏幕可用工作区高度:window.screen.availHeight.....:"+window.screen.availHeight+"\n"+
"屏幕可用工作区宽度:window.screen.availWidth.....:"+window.screen.availWidth+"\n"
}

</script>
    <script type="text/javascript">
    function IsConfirm()
    {
        return window.confirm('确定删除此记录吗？');
    }

    </script>
    </head>
    <body>

            <div>
            <div id="content_a" style="display:none; position:absolute;">
                        这是第一个DIV </div>

                <input type="button" onclick="checkValue();" value="尺寸调试">改变窗口的大小点击按钮看数值的变化
                    <div id="debug"> </div>

            </div>

</body>
</html>