js 实现点击按钮复制图片

我想实现一个,点击按钮就可以复制页面上的某个图片到剪贴板,该怎么做啊?

请看一个案例:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 

<html> 
<head> 

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 

<title>Insert title here</title> 

<SCRIPT LANGUAGE="JScript"> 

var oPopup = window.createPopup(); 
function ButtonClick(div) 
{ 
//var div = document.getElementById('divId'); 
div.contentEditable = 'true'; 
var controlRange; 
if (document.body.createControlRange) { 
controlRange = document.body.createControlRange(); 
controlRange.addElement(div); 
controlRange.execCommand('Copy'); 
} 
div.contentEditable = 'false'; 
} 
</SCRIPT> 
</head> 
<body> 
  <div id="divId1"> 
    <img src="F:/2012070518474964.jpg" onclick="ButtonClick(this)"> 
  </div> 
</BODY> 
</body> 
</html>

看看下面这个里面的方法试试
链接地址