var active;


function init(){
    var myElement = document.getElementById("0");
    myElement.style.display = "none";
    active=myElement;
}

function swapLayer(objMenu) {
    var myElement = document.getElementById(objMenu);
    if (myElement.style.display == "none") {
        active.style.display = "none";
        myElement.style.display = "block";
        active = myElement;
        }
    else {
    myElement.style.display = "none";
    }
}