function changeLng(pm_Lng) {
    tsURL = location.href;

    tsSlash = "";
    tsSlash = (tsURL.lastIndexOf("file://") == -1) ? "/" : "\\";

    tdLng = tsURL.lastIndexOf(tsSlash + "cn" + tsSlash);
    if (tdLng == -1) {
        tdLng = tsURL.lastIndexOf(tsSlash + "en" + tsSlash);
        tsNewLng = "cn";
    }
    else
        tsNewLng = "en";

    tsSite = tsURL.substring(0, tdLng);
    tsFilePath = tsURL.substring(tdLng + 4);

    tsURL = tsSite + tsSlash + tsNewLng + tsSlash + tsFilePath;

    //alert(tsURL);
    location.href = tsURL;
}