function customer_type(value) {
	var tr = document.createElement('tr');
	var display = tr.style.display;

	if (value == 'Dierenspeciaalzaak') {
		document.getElementById('fokker_row').style.display = 'none';
		document.getElementById('dsz_row').style.display = display;
	} else if (value == 'Fokker') {
		document.getElementById('fokker_row').style.display = display;
		document.getElementById('dsz_row').style.display = 'none';
	} else {
		document.getElementById('fokker_row').style.display = 'none';
		document.getElementById('dsz_row').style.display = 'none';
	}
}