[Plugin: Yet another ajax paged comments (YAAPC)] want to add somthing to the plugin

hi… i want to add a button to the plugin validator.
when visitors don’t fill in the form i want a button to popup (not text like now)
that will direct the visitor to the relavent field…
i tried to replace this:
beforeSubmit: function() {
if(form.find(‘#author’)[0]) {
if(form.find(‘#author’).val() == ”) {
msg.html(‘<div class=”notice”>’+’fill in the name’+'</div>’);

with this
beforeSubmit: function() {
if(form.find(‘#author’)[0]) {
if(form.find(‘#author’).val() == ”) {
msg.html(‘<div class=”notice”>’+’fix the field‘+'</div>’);

but when i do this it’s jumping” me to the old wordpress validator in the external page.

how do i do this ?

thank you