I try to change some links on a webpage using the following code for jQuery on Rails

$(function () {
  $('#lesson a').live('click', function () {
    $.getScript(this.href.replace(/^(http...[^\/]+)?\/+(.*)$/,'/ajax/\\$2'));
    return false;
  });
})

This trick works for Chrome and Safari, but fails (nothing happens on click) for Firefox and Opera. What can be wrong with the code?

EDIT1:

The webpage contains:

<div id="lesson">
  <a href="/subj1">Subject 1</a>
  ...
</div>

On click, a browser (i.e. Firefox and Opera) should make an ajax-request of /ajax/subj1.