// JavaScript Document

var objXMLHttp

function subscribe(str) {
  var regEx = /^[\w\.\+-]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,6}$/;
  if (!regEx.test(str)) {
        alert('Ungültige E-Mail Adresse. Bitte prüfen.');
    return false;
  }

  objXMLHttp=createXmlHttpObject();
  
  if (objXMLHttp==null) {
    alert ('Your browser does not support the XMLHttpRequest object!');
    return;
  }
  var inout = document.getElementById('in_out').value;
  var url='dosubscribe.php?in_out=' + inout + '&eml=' + str; // prevent caching
  objXMLHttp.onreadystatechange = stateChanged;
  objXMLHttp.open('GET',url,true); // GET method
  objXMLHttp.send(null); // always use null for GET method
}
  
function createXmlHttpObject() {
  var req = null;
  try {
    req = new XMLHttpRequest(); //ie7, ff, safari
  }
  catch (e) {
    try {
      req = new ActiveXObject("Msxml2.XMLHTTP"); //later ie
    }
    catch (e) {
      try {
        req = new ActiveXObject("Microsoft.XMLHTTP") // earlier ie
      }
      catch (e) {
        // could not create XMLHttpRequest object
        return false;
      }
    }
  }
  return req;
}

function stateChanged()
{
  if (objXMLHttp.readyState == 0)  {
    document.getElementById("newsletterfeld").innerHTML = "<img src='ajaxload.gif'>"; //uninitialized
  }
  else if(objXMLHttp.readyState == 1)  {
    document.getElementById("newsletterfeld").innerHTML = "<img src='ajaxload.gif'>"; //loading
  }
  else if(objXMLHttp.readyState == 2)  {
    document.getElementById("newsletterfeld").innerHTML = "<img src='ajaxload.gif'>"; //loaded
  }
  else if(objXMLHttp.readyState == 3)  {
    document.getElementById("newsletterfeld").innerHTML = "<img src='ajaxload.gif'>"; //interactive
  }
  else if (objXMLHttp.readyState == 4 || objXMLHttp.readyState == "complete") {
    document.getElementById("newsletterfeld").innerHTML=objXMLHttp.responseText // completed
  }
}