function getEl(id) { return document.getElementById(id); }
function setVisibility(id, v, b) { var e = getEl(id); if (v) { e.style.visibility = "visible"; e.style.display = (b ? "block" : "inline"); } else { e.style.display = "none"; e.style.visibility = "hidden"; } }
var currentTab = "";
function showtab(id) { if (currentTab != "") { setVisibility(currentTab, false, true); } currentTab = id; setVisibility(id, true, true); }