function makeRequestNB(url, parameters) {
  http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
     http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType) {
     	// set type accordingly to anticipated content type
        //http_request.overrideMimeType('text/xml');
        http_request.overrideMimeType('text/html');
     }
  } else if (window.ActiveXObject) { // IE
     try {
        http_request = new ActiveXObject("Msxml2.XMLHTTP");
     } catch (e) {
        try {
           http_request = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {}
     }
  }
  if (!http_request) {
     alert('Cannot create XMLHTTP instance');
     return false;
  }
  
  http_request.open("POST", url, true);

  //Send the proper header information along with the request
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  
  http_request.onreadystatechange = alertContentsNB;
  http_request.send(parameters);
}

function alertContentsNB() {
  if (http_request.readyState == 4) {
     if (http_request.status == 200) {
        //alert(http_request.responseText);
        result = http_request.responseText;
        document.getElementById('box_nieuwsbrief').innerHTML = result;       
     } else {
        alert('There was a problem with the request.');
     }
  }
}

function CheckEmail(obj) {
  var getstr = "?post=true&";
  
  //for (i=0; i<obj.childNodes.length; i++) {
  for (i=0; i<obj.elements.length; i++) {
      
    if (obj.elements[i].tagName == "INPUT") {     
     
        if (obj.elements[i].type == "text") {
           getstr += encodeURIComponent(obj.elements[i].name) + "=" + encodeURIComponent(obj.elements[i].value) + "&";
        }
        if (obj.elements[i].type == "hidden") {
           getstr += encodeURIComponent(obj.elements[i].name) + "=" + encodeURIComponent(obj.elements[i].value) + "&";
        }
        if (obj.elements[i].type == "checkbox") {
           if (obj.elements[i].checked) {
              getstr += obj.elements[i].name + "=" + encodeURIComponent(obj.elements[i].value) + "&";
              
           } else {
              getstr += obj.elements[i].name + "=&";
           }
        }
        if (obj.elements[i].type == "radio") {
           if (obj.elements[i].checked) {
              getstr += encodeURIComponent(obj.elements[i].name) + "=" + encodeURIComponent(obj.elements[i].value) + "&";
           }
        }
     }   
     if (obj.elements[i].tagName == "SELECT") {
        var sel = obj.elements[i];
        
        getstr += encodeURIComponent(sel.name) + "=" ;
        if(sel.value != "")
          getstr += encodeURIComponent(sel.options[sel.selectedIndex].value);
        getstr += "&";
     }
     if (obj.elements[i].tagName == "TEXTAREA") {
        var sel = obj.elements[i];
        getstr += encodeURIComponent(sel.name) + "=" + encodeURIComponent(sel.value) + "&";
     }
  }
  makeRequestNB('./objects/emailsnieuwsbrief.php', getstr);
}