Submit form_remote_tag with JavaScript

I'm trying to submit a form_remote_tag using javascript instead of an
input button. However, when I do this the ajax doesn't fire on submit.
Is there a way to do this?

try sth. like this:

<% form_tag :id => "search" do -%>
     <%= text_field_tag('search_field', params[:query], :autocomplete
=> "on" ) %>
<% end -%>
<%= observe_field 'search_field', :frequency => 1,
              :update => "activities",
              :url => { :controller => "your_controller",
                  :action => "search"
              :with => "query" %>

this will send a request to your search-method every time the user
typed sth. into the search_field.

hope this helps! smn

one more thing:
in my above example i used :update => "activities"

change "activities" to whatever the id of the element (div, table....)
is that you want to update

good luck! smn