function apri(iddiv){
    document.getElementById(iddiv).style.visibility = "Visible";
}
function chiudi(iddiv){
    document.getElementById(iddiv).style.visibility = "Hidden";
}
function setover(iddiv){
    document.getElementById(iddiv).style.background = "#CCCCCC";
}
function setout(iddiv){
    document.getElementById(iddiv).style.background = "#EEEEEE";
}