var imgs = new Array();
var imgso = new Array();
var loading = 0;
function preloadMenu()
{
  var menuCnt = 11;
  for (var i = 1; i < menuCnt+1; i++) {
    imgs[i] = new Image(); imgs[i].src = 'images/design/menu/menu' + i + '.gif';
    imgso[i] = new Image(); imgso[i].src = 'images/design/menu/menu' + i + 'o.gif'; 
  }
  loading = 1;
}

function changeImg(n, s) 
{
  if (loading != 0) (!s) ? $('menu'+n).src = imgs[n].src : $('menu'+n).src = imgso[n].src;   
}