function _addListener(element, event, fn) {
    if (window.attachEvent) {
        element.attachEvent('on' + event, fn);
    } else {
        element.addEventListener(event, fn, false);
    }
}
_addListener(window, 'load', attach_verify_field);
function attach_verify_field() {
    var el_comment = document.getElementsByName('comment');
    if (el_comment && el_comment[0]) {
        var container = el_comment[0].parentNode;
        var field = document.createElement('input');
        field.type='hidden';
        field.name='d1o2n3g4s5h6e7n8g9';
        field.value='';
        container.appendChild(field);
    }
}