var lastSelectedMenu;

window.onresize=adjustMenuPosition;

function adjustMenuPosition() {
  var w=document.body.clientWidth;
  var menu=document.getElementById("menu");
  if (w<800)
    menu.style.pixelLeft=19;
  else
    menu.style.pixelLeft=w/2-384;
}

function showMenu(menuId) {
  var menu=document.getElementById(menuId);

  if (lastSelectedMenu)
    if (lastSelectedMenu!=menu) fadingMenu(lastSelectedMenu.id);

  menu.style.display="block";
  lastSelectedMenu=menu;
}

function fadingMenu(menuId) {
  var menu=document.getElementById(menuId);

  menu.filters.alpha.opacity-=10;
  if (menu.filters.alpha.opacity==0) {
    menu.style.display="none";
    menu.filters.alpha.opacity=100;
  }
  else
    setTimeout("fadingMenu('"+menuId+"')",30);
}

function listenMouseClick() {
  if (lastSelectedMenu) fadingMenu(lastSelectedMenu.id);
}