function swapImage(target) {
	image0.src = target;
}

var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;

function showMenu(id) {
  cancelCloseMenu();
  if (ddmenuitem)
    ddmenuitem.style.visibility = 'hidden';
  ddmenuitem = document.getElementById(id);
  if (ddmenuitem)
    ddmenuitem.style.visibility = 'visible';
}

function closeMenu() {
  if (ddmenuitem)
    ddmenuitem.style.visibility = 'hidden';
}

function startClosingMenu() {
  closetimer = window.setTimeout(closeMenu, timeout);
}

function cancelCloseMenu()
{
  if (closetimer) {
    window.clearTimeout(closetimer);
    closetimer = null;
  }
}

document.onclick = startClosingMenu;