var menu_lock=false;
function hide_all_menus() {
document.getElementById('clube').style.visibility="hidden";
document.getElementById('eventos').style.visibility="hidden";
}

function show_menu(div) {
hide_all_menus();
document.getElementById(div).style.visibility="visible";
}

function hide_menu(div) {
document.getElementById(div).style.visibility="hidden";
}

function lock_menu(div) {
if(menu_lock==false) {
document.getElementById(div).style.visibility="hidden";
} else { return; }
}