function ShowHide(id1, id2) {
if (id1 != '') expMenu(id1);
if (id2 != '') expMenu(id2);
}

function expMenu(id) {
var itm = null;
if (document.getElementById) {
itm = document.getElementById(id);
} else if (document.all){
itm = document.all[id];
} else if (document.layers){
itm = document.layers[id];
}
if (!itm) {
// do nothing
}
else if (itm.style) {
if (itm.style.display == "none") { itm.style.display = ""; }
else { itm.style.display = "none"; }
}
else { itm.visibility = "show"; }
}