twitter bootstrap modal speedbump

HTML

<script src="http://twitter.github.com/bootstrap/assets/js/bootstrap.js"></script>
<div class="container">
 <p>1. External link should initiate speedbump <a href="http://google.com">http://google.com</a>.<br/>
  <span class="muted">(This is initializing modal but continue button is closing modal instead of sending to URL)</span></p>
 <p>This does not initiate speedbump due to exception <a href="mailto:">Email Us</a><br/>
  <span class="muted">(This is working as intended)</span></p>
 <p>What is the best way to add a whitelist to allow specific external URL's to pass without speed bump? For example, let these links through without speed bump</p>
 <ul>
  <li><a href="http://stackoverflow.com">http://stackoverflow.com</a></li>
  <li><a href="http://yahoo.com">http://yahoo.com</a></li>
 </ul>
 <p>Why does "http" initiate modal but using "www" prefix in URL does not initialize modal and appends URL to domain?<br/>
  <span class="muted">(For example: clicking the www.yahoo.com link below will generate a 404 because it's sending to jsfiddle.net/yahoo.com)</span></p>
 <p><a href="www.yahoo.com">www.yahoo.com</a></p>
 <div class="well muted">jQuery 1.9.1, bootstrap.min.js 2.3.0, bootstrap css http://twitter.github.com/bootstrap/assets/css/bootstrap*css</div>
</div>
<div id="speedbump" class="modal hide" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
 <div class="modal-header">
  <button class="close" type="button" data-dismiss="modal">×</button>
  <h3>Important Notice</h3>
 </div>
 <div class="modal-body">
  <p class="strong">You're leaving this website</p>
  <p>When you click continue you will connect to another website which we do not own or operate.</p>
 </div>
 <div class="modal-footer"><a id="url_link" class="btn btn-primary">Continue</a> <a class="btn" href="#" data-dismiss="modal">Cancel</a></div>
</div>

CSS

@import url('http://twitter.github.com/bootstrap/assets/css/bootstrap.css');
@import url('http://twitter.github.com/bootstrap/assets/css/bootstrap-responsive.css');
.container {margin-top: 10px;}

JavaScript

jQuery(document).ready(function () {
    // FIND EXTERNAL LINKS
    $.expr[":"].external = function (a) {
        // DO NOT INCLUDE THE FOLLOWING MATCHES: EMAIL LINKS, TELEPHONE LINKS, HOSTNAME
        return !a.href.match(/^mailto\:/) && !a.href.match(/^tel\:/) && a.hostname != location.hostname
    };
    // ADD BOOTSTRAP DATA-TOGGLE ATTRIBUTE TO THE LINKS
    $('a:external').attr('data-toggle', 'modal');
    // ADD BOOTSTRAP DATA-TARGET ATTRIBUTE TO THE LINKS
    $('a:external').attr('data-target', '#speedbump');
    // ADD EXTERNAL LINK CLASS .ext_link FOR STYLING
    $("a:external").addClass("ext_link");
    // ADD THE LINK AND TITLE TO THE MODAL WINDOW
    $(function () {
        $('a.ext_link').click(function () {
            var url = $(this).attr('href');
            var title = $(this).attr('title');
            $('#url_link').attr('href', url);
        });
    });
});