function toggle(obj) {
var el = document.getElementById(obj);
if (el.style.display != 'none') { el.style.display = 'none'; }
else { el.style.display = ''; }
}
function show(obj) {
var el = document.getElementById(obj);
el.style.display = '';
}
function hide(obj) {
var el = document.getElementById(obj);
el.style.display = 'none';
}