var schoolFields = new Array('title', 'address_1', 'address_2', 'city', 'state', 'zip', 'phone') ;

function disableSchoolFields() {
  for (i = 0; i < schoolFields.length; i++) {
    var field = document.getElementById('school_' + schoolFields[i]) ;
    field.disabled = true ;
  }
}

function enableSchoolFields() {
  for (i = 0; i < schoolFields.length; i++) {
    var field = document.getElementById('school_' + schoolFields[i]) ;
    field.disabled = false ;
  }
}