function copyToClipboard(txt) 
{ 
 if(window.clipboardData)  
  { 
    window.clipboardData.clearData(); 
    window.clipboardData.setData("Text", txt); 
  } 
  else if(navigator.userAgent.indexOf("Opera") != -1)  
  { 
    window.location = txt; 
  }  
  else if (window.netscape)  
  { 
    try  
    { 
      netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
    }  
    catch (e)  
    { 
      alert("您的firefox安全限制限制您进行剪贴板操作，请在地址栏中输入“about:config”将“signed.applets.codebase_principal_support”设置为“true”之后重试"); 
      return false; 
    } 
    var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard); 
    if (!clip) 
      return; 
    var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable); 
    if (!trans) 
      return; 
    trans.addDataFlavor('text/unicode'); 
    var str = new Object(); 
    var len = new Object(); 
    var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString); 
    var copytext = txt; 
    str.data = copytext; 
    trans.setTransferData("text/unicode",str,copytext.length*2); 
    var clipid = Components.interfaces.nsIClipboard; 
    if (!clip) 
      return false; 
    clip.setData(trans,null,clipid.kGlobalClipboard); 
	alert('支付宝帐号已复制成功');
  } 
}