form validation using RJS

rubyonrails-talk
1

Hi I have a form as below

<%= form_remote_tag :update => "update_sd_resolution_ui",                     :url => { :action => 'sd_resolution_save',                                :id => @sd_ticket.id, :sd_resolution_id=>@sd_resolution_id},                                :class => 'itilform'%>

<table> <th width=""><label for="" >Hr: </label></th>     <td><%= text_field :sd_resol, "hours", "size" => 2 %></td> </table

<%= end_form_tag %>

HERE HOW CAN I CHECK Hr field contains only numbers .How can i implement this using RJS.Say forexample can i call a javascript function for form checking from form_remote_tag above?

Sijo