function MenuOver(obj, type) {
    if ( type == 1 ) {
        document.getElementById(obj).style.display='block';
        if ( navigator.appName == "Netscape" ) {
            if ( document.getElementById('bb1') ) {
                document.getElementById('bb1').style.visibility='hidden';
                document.getElementById('bb2').style.visibility='hidden';
                document.getElementById('bb3').style.visibility='hidden';
                document.getElementById('bb4').style.visibility='hidden';
            }
        }
    } else {
        document.getElementById(obj).style.display='none';
        if ( navigator.appName == "Netscape" ) {
            if ( document.getElementById('bb1') ) {
                document.getElementById('bb1').style.visibility='visible';
                document.getElementById('bb2').style.visibility='visible';
                document.getElementById('bb3').style.visibility='visible';
                document.getElementById('bb4').style.visibility='visible';
            }
        }
    }
}