function radio_checker() {
			if (document.getElementById("custom_radio").checked) {
				document.getElementById("custom_bedrag").disabled = false;
				document.getElementById("custom_bedrag").focus();
			}
			else {
				document.getElementById("custom_bedrag").disabled = true;
			}
	}
	
	function radio_checker2() {
			if (document.getElementById("custom_radio2").checked) {
				document.getElementById("custom_methode").disabled = false;
				document.getElementById("custom_methode").focus();
			}
			else {
				document.getElementById("custom_methode").disabled = true;
			}
	}
	
	function radio_checker3() {
			if (document.getElementById("custom_radio3").checked) {
				document.getElementById("custom_nieuwsbrief").disabled = false;
				document.getElementById("custom_nieuwsbrief").focus();
			}
			else {
				document.getElementById("custom_nieuwsbrief").disabled = true;
			}
	}