function showlayer(obj1, obj2, layer, layer1) {
    var myLayer = document.getElementById(layer).style.display;
    var obj1class = document.getElementById(obj1).className;
    var obj2class = document.getElementById(obj2).className;
    if (myLayer == "none") {
        document.getElementById(layer).style.display = "block";
        document.getElementById(layer1).style.display = "none";
        document.getElementById(obj1).className = obj1class + ' active';
        document.getElementById(obj2).className = obj2class.replace(" active", "");
    } else {
        document.getElementById(layer).style.display = "none";
        document.getElementById(obj1).className = obj1class.replace(" active", "");
    }
}