function getId(id)
{
  return document.getElementById(id);
}

function mes24()
{
  var c24 = getId("c24");
  var mes_24 = getId("mes_24");

  if (mes_24.style.visibility == "visible")
  {
    c24.style.backgroundImage = "none";
    mes_24.style.visibility = "hidden";
  }
  else
  {
    c24.style.backgroundImage = "url('img/24.jpg')";
    mes_24.style.visibility = "visible";
  }
}

function help()
{
  var mes_help = getId("mes_help");
  if (mes_help.style.visibility == "visible") mes_help.style.visibility = "hidden";
  else mes_help.style.visibility = "visible";
}

function win_show(id)
{
  var win = getId("win");
  var text = getId("win" + id);
  win.innerHTML = '<div id="close" onClick="win_hide();"></div>' + text.innerHTML;
  win.style.visibility = "visible";
  getId("form").style.visibility = "hidden";
}

function win_hide()
{
  getId("win").style.visibility = "hidden";
}

function form_show()
{
  var form = getId("form");
  form.innerHTML = '<div id="close" onClick="form_hide();"></div>' + form.innerHTML;
  form.style.visibility = "visible";
  getId("win").style.visibility = "hidden";
}

function form_hide()
{
  getId("form").style.visibility = "hidden";
}

function validate()
{
  var mes = new Array("имя", "марку машины", "телефон");
  for (i=0; i<3; i++)
  {
    el = document.forms[0].elements[i];
    if (el.value == "")
    {
      alert("Введите " + mes[i] + "!");
      el.focus();
      return false;
    }
  }

  return true;
}