function showhide(what) {
switch (what) {
case "home1":
document.getElementById('home10').style.display = "none";
document.getElementById('home11').style.display = "block";
document.getElementById('home20').style.display = "block";
document.getElementById('home21').style.display = "none";
document.getElementById('home30').style.display = "block";
document.getElementById('home31').style.display = "none";
break;
case "home2":
document.getElementById('home10').style.display = "block";
document.getElementById('home11').style.display = "none";
document.getElementById('home20').style.display = "none";
document.getElementById('home21').style.display = "block";
document.getElementById('home30').style.display = "block";
document.getElementById('home31').style.display = "none";
break;
case "home3":
document.getElementById('home10').style.display = "block";
document.getElementById('home11').style.display = "none";
document.getElementById('home20').style.display = "block";
document.getElementById('home21').style.display = "none";
document.getElementById('home30').style.display = "none";
document.getElementById('home31').style.display = "block";
break;
default:
document.getElementById('home10').style.display = "none";
document.getElementById('home11').style.display = "block";
document.getElementById('home20').style.display = "block";
document.getElementById('home21').style.display = "none";
document.getElementById('home30').style.display = "block";
document.getElementById('home31').style.display = "none";
break;
}
}