js获取屏幕宽度及操作

<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>