function formulierControle(form) {
	var i, beg, end;

	var el;
	var naam;
	var soort;
	var error;
	var submit;
	
	error = document.getElementById("error_form");
	submit = true;	
	
	for  (i = 0; i < form.elements.length; i++) {
		el = form.elements[i];
		beg = el.name.indexOf ("[");
		end = el.name.indexOf ("]");
		
		if (beg >= 0) {
			
			soort = el.name.substr (beg - 3, 3);
			beg++;
			naam = el.name.substr (beg, end - beg);
			
			if ( (soort == "vpl" && el.value == "") || (naam == "Handtekening" && el.value.toLowerCase () != "akkoord")) {
				submit = false;
				el.style.borderColor = "red";
				el.style.borderWidth = "2px";
			} else {
				el.style.borderColor = "green";
				el.style.borderWidth = "1px";
			}
		}
	}
	
	if (!submit)
		error.innerHTML = "Vul de verplichte onderdelen in s.v.p.";
	
	return submit;
}