function gebid(id){
	return document.getElementById(id);
}
function ec(str){
	return encodeURIComponent(str);	
}
function schermpje(result){
	alert(result);
}
function niks(result){
	return true;
}
function ajax(url,vars,callbackFunction){

	if(window.XMLHttpRequest){
		var request = new XMLHttpRequest();
	} else {
		var request = new ActiveXObject('MSXML2.XMLHTTP.3.0');
	}

	request.open('POST',url,true);
	request.setRequestHeader('Content-Type','application/x-www-form-urlencoded');

	request.onreadystatechange = function(){
		if(request.readyState == 4 && request.status == 200){
			if(request.responseText){
				callbackFunction(request.responseText);
			}
		}
	}
	request.send(vars);
}
function display_neg_length(str,maximum){
	lengte = gebid(str).value.length;
	over = maximum-lengte;
	gebid(str+'_over').innerHTML = over;
}
function contact(){
	var poststr = "naam="+ec(gebid('naam').value)+"&captcha="+ec(gebid('captcha').value)+"&email="+ec(gebid('email').value)+"&vraag="+ec(gebid('bericht').value)+"&onderwerp="+ec(gebid('onderwerp').value)+'&submit=1';
	gebid('verzendknop').innerHTML = 'Moment..';
	gebid('verzendknop').disabled = true;
	ajax('/actions/contact.php',poststr,contactok);
}
function contactok(result){
	if(result == 'OK'){
		window.location = 'http://www.photomuseum.nl/bedankt.php';
	} else {
		gebid('melding').innerHTML = result;
		gebid('verzendknop').innerHTML = 'Verstuur';
		gebid('verzendknop').disabled = false;
	}
}