function isNS()
{
	return ((document.layers)?true:false);
}

function isN6()
{
	return (document.getElementById&&!document.all);
}

function isMac()
{
	return (navigator.platform.indexOf("Mac")!=-1);
}

function dGet(id,pid)
{
  if (isNS())
  {
    if (pid) return "document." + pid + ".document." +id;
    else return "document.layers['" + id + "']";
  }
  else
  {
    if (isN6()) return "document.getElementById('"+id+"')";
    else return "document.all['" + id + "']";
  }
}

function dShw(id,pid,bl)
{
  eval(dGet(id,pid) + ((!isNS())? ".style" : "") + ".visibility = " + ((bl)? "'visible'" : "'hidden'"));
}

function tancar_menu(id_menu, img_titol)
{
  eval(dGet("m"+id_menu,null) + ".style.display = 'none'");
}


function obrir_menu(id_menu, img_titol)
{
  eval(dGet("m"+id_menu,null) + ".style.display = 'block'");
}


function actualitzar_menu(id_menu)
{
  if (eval(dGet("m"+id_menu, null) + ".style.display") == "")
  {
    eval(dGet("m"+id_menu,null) + ".style.display = 'none'");
  }
  else
  {
    if (eval(dGet("m"+id_menu, null) + ".style.display") == "none")
    {
      eval(dGet("m"+id_menu,null) + ".style.display = 'block'");
    }
    else
    {
      eval(dGet("m"+id_menu,null) + ".style.display = 'none'");
    }
  }
}

function resetMenus(id_menu)
{
	if (id_menu == 0) { tancar_menu(1); tancar_menu(2); tancar_menu(3); }
	if (id_menu == 1) { obrir_menu(1); tancar_menu(2); tancar_menu(3); }
	if (id_menu == 2) { obrir_menu(1); obrir_menu(2); tancar_menu(3); }
	if (id_menu == 3) { tancar_menu(1); tancar_menu(2); obrir_menu(3);}
	
}