function nav_roll(id,name)
{
  if (statut != id)
  {
    if (document.images)
    {
      swap_layer('coverall','nav'+id+'','nav_'+name+'');
      swap_layer('coverall','navtxt','navtxt'+id+'_'+name+'');
    }
  }
}

function nav_click(id)
{
  if (document.images)
  {	
    if (ini == 1)
    {
      swap_layer('coverall','nav'+id+'','nav_on');
      statut=id;
      ini=2;
    }
    else
    {
      swap_layer('coverall','nav'+statut+'','nav_off');
      swap_layer('coverall','nav'+id+'','nav_on');
      statut=id;
    }
  }
}