[web2py] form in bootstrap modal

[R U]

I have embedded a form inside of a bootstrap modal.  If the form is filled
in correctly it redirects.  If there are errors the modal closes and the
main page goes back to how it first looked.  Only when I click on the "Sign
up Here" button does it reveal that there were errors and what the errors
are.  Any idea on how to keep the modal open if there are errors

Thanks

view:::::::

 <button type="button" class="btn btn-info btn-lg" data-toggle="modal"
data-target="#myModal">Sign up Here</button>

<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Here is all the informaiton we will need
from you.</h4>
          <h4 class="modal-title">
              some more info about this modal
          </h4>
      </div>
      <div class="modal-body">
        <p>{{=index}}</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default"
data-dismiss="modal">Close</button>
      </div>
    </div>

  </div>
</div>

controller::::::

def index():

    form=SQLFORM(userdb.person)
    if form.process(keepvalues=True).accepted:
        response.flash = "Thank you for filling out the form."
        redirect(URL('thank_you'))
    elif form.errors:
        response.flash = "form has errors"
    else:
        response.flash = "please fill out the form"
    return dict(index=form)

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