browserName = navigator.appName;
    browserVer = parseInt ( navigator.appVersion );
    version = "n2";
    if ( browserName == "Netscape" && browserVer >= 4 ) version = "n4";
    if ( browserName == "Microsoft Internet Explorer" && browserVer >=4 ) version = "e4";
    if ( version == "n4" || version == "e4" ) {
        news_on = new Image ( 134, 18);
        news_on.src = "unews.png";
        shot_on = new Image ( 134, 18);
        shot_on.src = "ushot.png";
        file_on = new Image ( 134, 18);
        file_on.src = "ufile.png";
        cont_on = new Image ( 134, 18);
        cont_on.src = "ucont.png";

        news_off = new Image ( 134, 18);
        news_off.src = "snews.png";
        shot_off = new Image ( 134, 18);
        shot_off.src = "sshot.png";
        file_off = new Image ( 134, 18);
        file_off.src = "sfile.png";
        cont_off = new Image ( 134, 18);
        cont_off.src = "scont.png";
    }

    function _on ( imgName ) {
        if ( version == "n4" || version == "e4" ) {
            butOn = eval ( imgName + "_on.src" );
            document [imgName].src = butOn;
        }
    }

    function _off ( imgName ) {
        if ( version == "n4" || version == "e4" ) {
            butOff = eval ( imgName + "_off.src" );
            document [imgName].src = butOff;
        }
    }