if (document.images) {
  var menu1up = new Image();
  menu1up.src = "../imgs/menu/menu_1d.gif";
  var menu1down = new Image();
  menu1down.src = "../imgs/menu/menu_1u.gif";
  
  var menu2up = new Image();
  menu2up.src = "../imgs/menu/menu_2d.gif";
  var menu2down = new Image();
  menu2down.src = "../imgs/menu/menu_2u.gif";
  
  var menu3up = new Image();
  menu3up.src = "../imgs/menu/menu_3d.gif";
  var menu3down = new Image();
  menu3down.src = "../imgs/menu/menu_3u.gif";
  
  var menu4up = new Image();
  menu4up.src = "../imgs/menu/menu_4d.gif";
  var menu4down = new Image();
  menu4down.src = "../imgs/menu/menu_4u.gif";
  
  var menu5up = new Image();
  menu5up.src = "../imgs/menu/menu_5d.gif";
  var menu5down = new Image();
  menu5down.src = "../imgs/menu/menu_5u.gif";
  
  var menu6up = new Image();
  menu6up.src = "../imgs/menu/menu_6d.gif";
  var menu6down = new Image();
  menu6down.src = "../imgs/menu/menu_6u.gif";
  
  var menu7up = new Image();
  menu7up.src = "../imgs/menu/menu_7d.gif";
  var menu7down = new Image();
  menu7down.src = "../imgs/menu/menu_7u.gif";
  
  var menu8up = new Image();
  menu8up.src = "../imgs/menu/menu_8d.gif";
  var menu8down = new Image();
  menu8down.src = "../imgs/menu/menu_8u.gif";
  
  var menu9up = new Image();
  menu9up.src = "../imgs/menu/menu_9d.gif";
  var menu9down = new Image();
  menu9down.src = "../imgs/menu/menu_9u.gif";
  
  }

function act(imgName) {
  if (document.images) 
    document[imgName].src = eval(imgName + "down.src"); 
}

function inact(imgName) {
  if (document.images)
    document[imgName].src = eval(imgName + "up.src");
}