LLevo varios dias trasteando con un plugin siguiendo el...

<!-- Button trigger modal -->

<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">

  Launch demo modal

</button>



<!-- Modal -->

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">

  <div class="modal-dialog">

    <div class="modal-content">

      <div class="modal-header">

        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>

        <h4 class="modal-title" id="myModalLabel">Modal title</h4>

      </div>

      <div class="modal-body">

        ...

      </div>

      <div class="modal-footer">

        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

        <button type="button" class="btn btn-primary">Save changes</button>

      </div>

    </div>

  </div>

</div>

<div class="container">

<h2>Example of creating Modals with Twitter Bootstrap</h2>

<div id="example" class="modal hide fade in" style="display: none; ">

            <div class="modal-header">

              <a class="close" data-dismiss="modal">×</a>

              <h3>Cabecera de la ventana</h3>

            </div>

            <div class="modal-body">

              <h4>Texto de la ventana</h4>

              <p>Mas texto en la ventana.</p>		        

            </div>

            <div class="modal-footer">

              <a href="index.html" class="btn btn-success">Guardar</a>

              <a href="#" class="btn" data-dismiss="modal">Cerrar</a>

            </div>

          </div>

<p><a data-toggle="modal" href="#example" class="btn btn-primary btn-large">Abrir ventana modal</a></p>

<script src="jquery.js"></script>

<script src="bootstrap-modal.js"></script>