if (window.XMLHttpRequest) {XMLHttpRequestObject = new XMLHttpRequest();}
else if (window.ActiveXObject) {XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");}
function sendContactForm()
{
  if(XMLHttpRequestObject)
  {
    document.getElementById('contactMessage').innerHTML = 'Subscribing...';
    XMLHttpRequestObject.open("POST", "mailing_list.php", true);
    XMLHttpRequestObject.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    XMLHttpRequestObject.onreadystatechange = function()
    {
      if (XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) 
      {
        var contactFormResponce = XMLHttpRequestObject.responseText;
        document.getElementById('contactMessage').innerHTML = contactFormResponce;
      }
    }
    XMLHttpRequestObject.send("email="+escape(document.getElementById('email').value));
  }
}