var opened = null;
var d = new Date();
var m=d.getMonth();
var y=d.getYear();
var dat =d.getDate();

function sSubMenu(id)
{
    if(opened != null){
        opened.style.visibility="hidden"; 
    }
    
    opened = document.getElementById(id);
    if(opened != null) {
        opened.style.visibility="visible";
    }
}

function hSubMenu(id)
{
    var layer = document.getElementById(id);
    if(layer != null){
        layer.style.visibility="hidden";
     }
}