Using Ajax in different browsers

Rails
1

I am using quick Ajax in place editing with autocomplete:

<% form_tag :action => ‘dnsShrani’, :dns => params[:dns] do %>
<%= text_field_with_auto_complete :vpis, :dns, { :class => ‘text’}%>
<%= submit_tag “Shrani”, { :class => ‘button’} %>
<%= link_to ‘Preklic’, :action => ‘show’ %>
<% end %>

Translation:
Shrani==Save
Preklic==Cancel

I have attached a picture of how this example looks in three different
web browsers. Notice the blank space (line) added to the bottom of edit
box in Opera and IE 7 and how it looks perfect in FireFox.

Do you guys have the same problem and can it be avoided in IE or Opera?

Thanks

TheR