function addline() 
{
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf ( "MSIE " );
    var verIE = parseInt(ua.substring (msie+5, ua.indexOf (".", msie )));
    var isIE = navigator.appVersion.indexOf("MSIE");
    var supportAll = (document.all != null);
    var uaprod = navigator.product;
    var uavendor = navigator.vendor;
    var uaver = navigator.vendorSub;
    var uaAppName = navigator.appName; 
    var isFF = navigator.userAgent.indexOf("Firefox");

    // For debug...  
    //document.write("IE version=", verIE);
    //document.write("  msie=", msie);
    //document.write("  supportAll=", supportAll);
    //document.write("  navprod=", uaprod);
    //document.write("  navendor=", uavendor);
    //document.write("  naversion=", uaver);

    if ((isFF == 75) || (isFF == 76) || (isFF == 77) || (isFF == 78))
    {
        document.write('<BR>');

    }
} 

addline();