var path = "iface/images/menu/";

function btn(n, p) {
  var b = eval("document.images.btn" + n);
  if (b)
    b.src = path + "btn" + n + "_" + p + ".gif";      
  else
    self.status = "Error: document not contains image named: btn" + n; 
}

function loadMenu() {
  var img_b = new Array();
  var img_a = new Array();
  
  for (var i = 1; i < 9; i++) {
    img_a[i] = new Image();
    img_a[i].src = path + "btn" + i + "_b.gif";

    img_b[i] = new Image();
    img_b[i].src = path + "btn" + i + "_b.gif";
    
  }
}

loadMenu();