function disableField() {
	if ( document.surveys.notastudent.checked == true ){
		document.surveys.grade.disabled=true;
		document.surveys.grade.className="fieldsDisabled";
		document.surveys.grade.value="";
		document.surveys.teacher.disabled=true;
		document.surveys.teacher.className="fieldsDisabled";
		document.surveys.teacher.value="";
		document.surveys.subject.disabled=true;
		document.surveys.subject.className="fieldsDisabled";
		document.surveys.subject.value="";
		document.surveys.school.disabled=true;
		document.surveys.school.className="fieldsDisabled";
		document.surveys.school.value="";
		document.surveys.school_other.disabled=true;
		document.surveys.school_other.className="fieldsDisabled";
		document.surveys.school_other.value="";
		} else {
		document.surveys.grade.disabled=false;
		document.surveys.grade.className="fields";
		document.surveys.teacher.disabled=false;
		document.surveys.teacher.className="fields";
		document.surveys.subject.disabled=false;
		document.surveys.subject.className="fields";
		document.surveys.school.disabled=false;
		document.surveys.school.className="fields";
		document.surveys.school_other.disabled=false;
		document.surveys.school_other.className="fields";
	}
}