function focus_btn(btn)
{
  btnid = "btn-" + btn;
  img = document.getElementById(btnid);
  img.src = btnid + "1.jpg";
}
function normal_btn(btn)
{
  btnid = "btn-" + btn;
  img = document.getElementById(btnid);
  img.src = btnid + "2.jpg";
  img.blur();
  img.selected = false;
}
function normalize(id)
{
  aref = document.getElementById(id);
  aref.blur;
  normal_btn(id);
  aref.selected = false;
}