function toggle_nummerbehoud(){
	var obj = document.getElementById("nummerbehoud");
	var obj1 = document.getElementById("nummerbehoudtr1");
	var obj2 = document.getElementById("nummerbehoudtr2");
	var obj3 = document.getElementById("nummerbehoudtrsim");
	var obj4 = document.getElementById("nummerbehoudtrabo");
	var obj5 = document.getElementById("nummerbehoudtr3");
	var obj6 = document.getElementById("nummerbehoudtr4");
	var obj7 = document.getElementById("nummerportering");

	if($('aantal')){
		var obj8 = document.getElementById("klantnr");
		if (obj.checked) {
			obj8.style.display="";
		}
		else {
			obj8.style.display="none";
		}
			if ($('aantal').value > 1){
			obj1.style.display="none";
			obj2.style.display="none";
			obj3.style.display="none";
			obj4.style.display="none";
			obj5.style.display="none";
			obj6.style.display="none";
			obj7.style.display="none";			
			return;
		}
	}

	if (obj && obj.checked) {
		obj1.style.display="";
		obj2.style.display="";
		obj5.style.display="";
		obj6.style.display="";
		//togglenetwerk();
		if (document.forms['bestel'].elements['abonnement'][0].checked) {
			toggle2(0);
		}
		else {
			toggle2(1);
		}
	}
	else {
		obj1.style.display="none";
		obj2.style.display="none";
		obj3.style.display="none";
		obj4.style.display="none";
		obj5.style.display="none";
		obj6.style.display="none";
		obj7.style.display="none";
	}
}

function toggle2(which){
	var obj1 = document.getElementById("nummerbehoudtrsim");
	var obj2 = document.getElementById("nummerbehoudtrabo");
	var obj3 = document.getElementById("nummerportering");
	
	obj1.style.display = "";
	
	if (which==1){
		obj2.style.display = "none";
		obj3.style.display = "";
	}
	else {
		obj2.style.display = "";
		if (document.forms['bestel'].elements['opgezegd'][0].checked) {
			obj3.style.display = "";
		}
		else {
			obj3.style.display = "none";
		}
	}
}

function toggle3(which){
	var obj1 = document.getElementById("nummerportering");
	if (which == 1){
		obj1.style.display = "";
	}
	else {
		obj1.style.display = "none";
	}
}

function toggleideal(){
	var obj1 = document.getElementById("betaling_ideal");
	if (document.forms['bestel'].elements['betaling'][2].checked){
		obj1.style.display = "";
	}
	else {
		obj1.style.display = "none";
	}
}

function removeAllOptions(selectbox){
	var i;
	for(i=selectbox.options.length-1;i>=0;i--){
		selectbox.remove(i);
	}
}

function addOption(selectbox, value, text ){
	var option = document.createElement("OPTION");
	option.text = text;
	option.value = value;

	selectbox.options.add(option);
}