function display_customers_login() {
  document.getElementById("customers_login").style.display = "block";
  fill_customers_login_layer();
}
function hide_customers_login() {
  document.getElementById("customers_login").style.display = "none";
}
function fill_customers_login_layer() {
  var xmlhttp=false;
  if (!xmlhttp && typeof XMLHttpRequest!='undefined')  {
    xmlhttp = new XMLHttpRequest();
  }
  xmlhttp.open("GET", 'ajax_customers_login.php?m=1', true);
  xmlhttp.onreadystatechange=function() {
    if (xmlhttp.readyState == "4") {
      document.getElementById("customers_login").innerHTML=xmlhttp.responseText;
    }
  }
  xmlhttp.send(null)
  return false;
}