custom.js

$(document).ready(function() {
	
// Support for AJAX loaded modal window.
// Focuses on first input textbox after it loads the window.
$('[data-toggle="modal"]').click(function(e) {
	e.preventDefault();
	var url = $(this).attr('href');
	if (url.indexOf('#') == 0) {
		$(url).modal('open');
	} else {
		$.get(url, function(data) {
			$('<div class="modal hide fade">' + data + '</div>').modal();
		}).success(function() { $('input:text:visible:first').focus(); });
	}
});
	
});

index.htm

<a href="/url/to/load/modal_window.htm" data-toggle="modal">link</a>

modal_window.htm

<div class="modal-header">
	<a class="close" data-dismiss="modal">&times;</a>
	<h3>Modal header 2</h3>
</div>
<div class="modal-body">
	<p>One body...</p>
</div>
<div class="modal-footer">
	<a class="btn btn-primary" onclick="$('.modal-body > form').submit();">Save Changes</a>
	<a class="btn" data-dismiss="modal">Close</a>
</div>