function onMouseOverMenu1() {
    document.getElementById('menu1').style.display = 'block';
}

function MouseDownMenu1() {
    document.getElementById('menu1').style.display = 'none';
}

function onMouseOverMenu2() {
    document.getElementById('menu2').style.display = 'block';
}

function MouseDownMenu2() {
    document.getElementById('menu2').style.display = 'none';
}