function active(leDiv) {
if (document.getElementById) {
var actDiv = document.getElementById(leDiv);
if (window.lastDiv)
window.lastDiv.className = "invisible";
actDiv.className = "visible";
lastDiv = actDiv;
}
}

function active2(leDiv1, leDiv2) {
if (document.getElementById) {
var actDiv1 = document.getElementById(leDiv1);
var actDiv2 = document.getElementById(leDiv2);
if (window.lastDiv1)
window.lastDiv1.className = "invisible";
if (window.lastDiv2)
window.lastDiv2.className = "invisible";
actDiv1.className = "visible";
actDiv2.className = "visible";
lastDiv1 = actDiv1;
lastDiv2 = actDiv2;
}
}