Sample of intercepting a submission to third party site, doing ajax submit to Webvanta first, getting a unique ID

sample_intercept_contact_form.html

<div id='contact_intro'>
  <h1>Contact <span>Us</span></h1>
<p>Please complete the form below and click the Submit button at the bottom.</p>
<p>We&#8217;ll reply as soon as possible.</p>
</div>

<div id='contact_pod_error' class='sysmsg'><w:sysmsg /></div>
<div id='contact_pod_form' class="box-s1">
  <form id='contact_form' action='OTHERSITES ACTION URL GOES HERE' method='post' autocomplete='off'>
    <p><label>NAME</label>
      <input type='text' id='contact_firstname' class='initial_focus' name='contact[firstname]' />
      <input type='text' id='contact_lastname' name='contact[lastname]' />
    </p>
    <p class="alt"><label>COMPANY</label>
      <input type='text' id='contact_company' name='contact[company]' />
    </p>
    <p><label>EMAIL</label>
      <input type='text' id='contact_email' class='required' name='contact[email]' />
    </p>
    <p id='email2'><label>EMAIL</label>
      <input type='text' id='contact_email2' name='contact[email2]' />
    </p>
    <p class="alt"><label>SUBJECT</label>
      <input type='text' id='contact_subject' name='contact[subject]' />
    </p>
    <p><label>MESSAGE</label>
      <textarea id='contact_message' rows='8' cols='80'  class='required' name='contact[message]'></textarea>
    </p>
    <p class="alt">
      <input type='hidden' id='contact_ajax' name='contact[ajax]' value='json' />
    </p>
  </form>
  <button type="button" id="form_submit_button"><img src='/webvanta_theme_images/blog/button-submit.gif' alt="Send Your Message" /></button>
</div>

<script type="text/javascript">
  $(function(){
    $("#form_submit_button").click(function(){
      var first_name = $("form #contact_firstname").val();
      var last_name = $("form #contact_lastname").val();
      $.post('/crm_receiver',
                    {
                    'form_id' : 'crm_id',
                    'email2' : '',
                    'ajax' : 'json',
                    'crm_id[crm][name]' : first_name + " " + last_name
                    },
                    function(d) {
                      if (d.status == 'ok') {
                        $("form #contact_subject").val(d.id || 'unknown id');
                        $("form:first").submit();
                      }
                    },
                   'json'
               );

    });
  }); 
</script>