function akkoord() {
	var submit= document.getElementById('register_submit');
	var checkbox= document.getElementById('register_checkbox');
	var akkoord = confirm("Weet je zeker dat je akkoord gaat?");
	if(akkoord == true) {
		submit.disabled = false;
		submit.style.background = "url('/img/register.png')";
		checkbox.checked = true;
		checkbox.disabled = true;
	}
	if(akkoord == false) {
		checkbox.checked = false;
	}
}