function check_form(lang){

	var httpObj = false;
		httpObj = window.XMLHttpRequest ? new window.XMLHttpRequest : (window.ActiveXObject ? new ActiveXObject("MSXML2.XMLHTTP"): null);
		httpObj.onreadystatechange = function() {
		if (httpObj.readyState == 4) {
			document.getElementById('temp').value = httpObj.responseText;
		}
	};
	httpObj.open('POST', 'http://www.melroy.a-test.nl/email.php?email='+document.getElementById('email').value, true);
	httpObj.send(null);
	
	
	if(document.getElementById('tekst').innerHTML !== "" &&	document.getElementById('naam').value !== "" &&	document.getElementById('temp').value == "true"){
		document.getElementById('send').disabled=false;
		if(lang == "nl"){
			document.getElementById('message').innerHTML="U kunt uw bericht nu versturen.";
		}
		else{
			document.getElementById('message').innerHTML="You are now able to send your message.";
		}
	}
	else{
		document.getElementById('send').disabled=true;
		if(lang == "nl"){
			document.getElementById('message').innerHTML="U moet uw naam, een correct e-mail adres en een bericht in vullen.";
		}
		else{
			document.getElementById('message').innerHTML="You have to fill in a name, a valid e-mail adress and a message.";
		}
	}
}