if (window.netscape) {
try {
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
} catch (e) {
if (flag == 0) {
alert("You are using the Firefox browser, copy the function browser refuse！
/nPlease in the browser address bar enter'about:config' and Enter /n and set'signed.applets.codebase_principal_support' to 'true'");

} else {
alert("你使用的是Firefox 浏览器,复制功能被浏览器拒绝！/n请在浏览器地址栏输入'about:config'
并回车/n然后将'signed.applets.codebase_principal_support'设置为'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 = 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);

}