function change(id){
el = document.getElementById(id);
if (el.style.display == "none")
el.style.display = "block";
else
el.style.display = "none";
}

function changePort(id){
document.getElementById('d1').style.display = "none";
document.getElementById('d2').style.display = "none";
document.getElementById('d3').style.display = "none";
document.getElementById('d4').style.display = "none";
document.getElementById('d5').style.display = "none";
document.getElementById('d6').style.display = "none";
document.getElementById('d7').style.display = "none";
document.getElementById('d8').style.display = "none";
document.getElementById('d9').style.display = "none";
document.getElementById('d10').style.display = "none";
document.getElementById('d11').style.display = "none";
document.getElementById('d12').style.display = "none";
document.getElementById('d14').style.display = "none";
document.getElementById('d15').style.display = "none";
document.getElementById('d16').style.display = "none";

document.getElementById(id).style.display = "block";
}