function check_univ(drop) {

    var toshow17 = 'none';
	    var toshow0 = 'none';

    if (drop.value == 17) {

        toshow17 = 'block';

	document.getElementById('voucher_id').value = "";
	document.getElementById('student_id').value = "";

    }
    else if (drop.value == 'null') {

        toshow0 = 'block';

    }
    document.getElementById('internal_delegate_div').style.display = toshow17
	document.getElementById('other_delegate_div').style.display = toshow0
	

}