function showMenuI(menu){
currentMenu = menu;

showCurrentMenuI();
}
function showCurrentMenuI(){

        if(currentMenu != "none"){
if(document.getElementById(currentMenu).style.visibility == "visible"){
document.getElementById("6M").style.visibility= "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

currentMenu = "none";

}
else if(currentMenu == "6M"){

document.getElementById("6M").style.visibility = "visible";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "20M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "visible";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "19M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "visible";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "18M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "visible";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "4M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "visible";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "3M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "visible";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "12M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "visible";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "13M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "visible";
document.getElementById("22M").style.visibility = "hidden";

}
else if(currentMenu == "22M"){
document.getElementById("6M").style.visibility = "hidden";
document.getElementById("20M").style.visibility = "hidden";
document.getElementById("19M").style.visibility = "hidden";
document.getElementById("18M").style.visibility = "hidden";
document.getElementById("4M").style.visibility = "hidden";
document.getElementById("3M").style.visibility = "hidden";
document.getElementById("12M").style.visibility = "hidden";
document.getElementById("13M").style.visibility = "hidden";
document.getElementById("22M").style.visibility = "visible";

}
}
else{

}
}