function makeRequestTAF(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 = alertContentsTAF;
  http_request.send(parameters);
}

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

function CheckTellAFriend(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) + "&";
     }
  }
  
  //check mailing
  //predefine variable
  var sendthis = true;
  //
  if(document.getElementById("taf_me_email").value == ""){
    sendthis = false;    
    document.getElementById("taf_me_email").style.backgroundImage = "url('./a/i/g/invulveld-taf-wrong.png')";    
    }
  if(document.getElementById("taf_friend_email").value == ""){
    sendthis = false;    
    document.getElementById("taf_friend_email").style.backgroundImage = "url('./a/i/g/invulveld-taf-wrong.png')";    
    }
    
  if(sendthis == false){
    document.getElementById("taf_message").innerHTML = "Gelieve alle verplichte velden in te vullen!";
    }
  else{
    //validatemails
    var vEmail = validateEmail("taf_me_email");
    var vEmailTo = validateEmail("taf_friend_email");
    //check to send
    if(vEmail == false){
      sendthis = false;
      document.getElementById("taf_me_email").style.backgroundImage = "url('./a/i/g/invulveld-taf-wrong.png')";
      }
    if(vEmailTo == false){
      sendthis = false;      
      document.getElementById("taf_friend_email").style.backgroundImage = "url('./a/i/g/invulveld-taf-wrong.png')";
      }
    if(sendthis == false){
      document.getElementById("taf_message").innerHTML = "Gelieve geldige emailadressen in te vullen!";
      }
    }
  //check to send
  if(sendthis == true){
    makeRequestTAF('./objects/tellafriend.php', getstr);
    ResetForm(obj);
    }
  }

  
function ResetMyField(elem){  
  if(document.getElementById(elem).style.backgroundImage == "url(./a/i/g/invulveld-taf-wrong.png)"){
    document.getElementById("taf_message").innerHTML = "";
    document.getElementById(elem).value = "";
    document.getElementById(elem).style.backgroundImage = "url('./a/i/g/invulveld-tell-a-friend.png')";
    }
  }
  
function ResetForm(obj){
  for (i=0; i<obj.elements.length; i++) {
    if (obj.elements[i].tagName == "INPUT") {     
      if (obj.elements[i].type == "text") {
        obj.elements[i].value = ""; 
        }
      if (obj.elements[i].type == "checkbox") {
        obj.elements[i].checked = false;      
        }
      if (obj.elements[i].type == "radio") {
        obj.elements[i].checked = false;      
        }
      }   
    if (obj.elements[i].tagName == "SELECT") {
      obj.elements[i].value = "";     
      }
    if (obj.elements[i].tagName == "TEXTAREA") {
      obj.elements[i].value = "";     
      }
    }  
  document.getElementById("taf_message").innerHTML = "";
  }