function textLink(source,alter) {
	var id	=	document.getElementById("link");
	id.src	=	source;
	id.alt	=	alter;
}

window.onload = GetXmlHttpObject;

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}
var xmlhttp;

function checkName(str) {
	if(str.length==0) {
	  document.getElementById("txtName").innerHTML="";
	  return;
	}
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null) {
	  alert ("Your browser does not support XMLHTTP!");
	  return;
	}
	var url="/includes/getName.php";
	url=url+"?nm="+str;
	xmlhttp.onreadystatechange=updateName;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
}
function updateName() {
	if (xmlhttp.readyState==4) {
	  document.getElementById("txtName").innerHTML=xmlhttp.responseText;
	  return true;
	}
}

var xmlhttp;

function checkMail(str) {
	if (str.length==0) {
	  document.getElementById("txtMail").innerHTML="";
	  return;
	}
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null) {
	  alert ("Your browser does not support XMLHTTP!");
	  return;
	}
	var url="/includes/gethint.php";
	url=url+"?q="+str;
	xmlhttp.onreadystatechange=stateChanged;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
}
function stateChanged() {
	if (xmlhttp.readyState==4) {
	  document.getElementById("txtMail").innerHTML=xmlhttp.responseText;
	  return true;
	}
}

var xmlhttp;

function checkBericht(str) {
	if (str.length==0) {
	  document.getElementById("txtBericht").innerHTML="";
	  return;
	}
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null) {
	  alert ("Your browser does not support XMLHTTP!");
	  return;
	}
	var url="/includes/ber.php";
	url=url+"?ber="+str;
	xmlhttp.onreadystatechange=updateBericht;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
	return true;
}
function updateBericht() {
	if (xmlhttp.readyState==4) {
	  document.getElementById("txtBericht").innerHTML=xmlhttp.responseText;
	  return true;
	}
}

function validateForm() {
	var returnwaarde = true;
	if(document.getElementById('naam').value == '') {returnwaarde = false;}
	if(document.getElementById('email').value == '') {returnwaarde = false;}
	if(document.getElementById('bericht').value == '') {returnwaarde = false;}
	
	if(returnwaarde == true) {
		return true;
	} else {
		alert('Vul aub de verplichte velden in.');
		return false;
	}
}