function setClipboard(maintext) { 
   if (window.clipboardData) { 
      return (window.clipboardData.setData("Text", maintext)); 
   } 
   else if (window.netscape) { 
        try {
            netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
        }
        catch (e)
        {
            alert("瀏覽器不支援！\n請在網址列輸入'about:config'按Enter\n然後將'signed.applets.codebase_principal_support'設定為'true'");
        }
      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=maintext; 
      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); 
      return true; 
   } 
   return false; 
} 

function getClipboard() { 
   if (window.clipboardData) { 
      return(window.clipboardData.getData('Text')); 
   } 
   else if (window.netscape) { 
      netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect'); 
      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'); 
      clip.getData(trans,clip.kGlobalClipboard); 
      var str = new Object(); 
      var len = new Object(); 
      try { 
         trans.getTransferData('text/unicode',str,len); 
      } 
      catch(error) { 
         return null; 
      } 
      if (str) { 
         if (Components.interfaces.nsISupportsWString) str=str.value.QueryInterface(Components.interfaces.nsISupportsWString); 
         else if (Components.interfaces.nsISupportsString) str=str.value.QueryInterface(Components.interfaces.nsISupportsString); 
         else str = null; 
      } 
      if (str) { 
         return(str.data.substring(0,len.value / 2)); 
      } 
   } 
   return null; 
}