function over(id)
{
  document.getElementById("im-" + id).src = "./../img/menu_over/" + id + ".png";

  menuHide();
    
  if ((id == "products") || (id == "dtp") || (id == "production"))
  {
    menuShow(id);
  }
}


function out(id)
{
  document.getElementById("im-" + id).src = "./../img/menu_out/" + id + ".png";
}


function menuHide()
{
  var subs = new Array("products", "dtp", "production");
  for (i = 0; i < subs.length; i++)
  {
    //document.getElementById("s-" + subs[i]).style.visibility = "hidden";
    document.getElementById("s-" + subs[i]).style.display = "none";
  }
}


function menuShow(id)
{
  //document.getElementById("s-" + id).style.visibility = "visible";
  document.getElementById("s-" + id).style.display = "block";
}