function hfd2check(status){
	if(status == 'ja'){
		document.getElementById('hoofdstuk2').style.display = "block";
	} else {
		document.getElementById('hoofdstuk2').style.display = "none";
	}
}

window.onload = function(){
	var inputs = document.getElementById('special-select').getElementsByTagName('input');
	for(var i=0;i<inputs.length;i++){
		inputs[i].onclick = function(){
				//checkforspecials();
		}
	}
	
	var inputs = document.getElementById('chapter-select').getElementsByTagName('input');
	for(var i=0;i<inputs.length;i++){
		inputs[i].onclick = function(){
				//checkforchapters();
		}
	}
	
	//checkforspecials();
	//checkforchapters();
}

function checkforspecials(){
	var inputfields = document.getElementById('special-select').getElementsByTagName('input');
	var specialselected = false;
	for(var j=0;j<inputfields.length;j++){
		if(inputfields[j].checked == true){
			specialselected = true;	
		}
	}
	if(specialselected == true){
		document.getElementById('chapter-select').style.display = "none";
		document.getElementById('chapterinfo').style.display = "none";
	} else {
		document.getElementById('chapter-select').style.display = "block";
		document.getElementById('chapterinfo').style.display = "block";
	}	
}

function checkforchapters(){
	var inputfields = document.getElementById('chapter-select').getElementsByTagName('input');
	var chapterselected = false;
	for(var j=0;j<inputfields.length;j++){
		if(inputfields[j].checked == true && inputfields[j].disabled == false){
			chapterselected = true;	
		}
	}
	if(chapterselected == true){
		document.getElementById('special-select').style.display = "none";
		document.getElementById('special_head').style.display = "none";
	} else {
		document.getElementById('special-select').style.display = "block";
		document.getElementById('special_head').style.display = "block";
	}	
}