Attaching hashtag to URL with javascript

You can change the location.hash property, it will change the current anchor identifier without navigating away form the page, for example you could:

<a href="http://mysite.com/cats" id="cats" class="ajaxLink">Cats</a>
<a href="http://mysite.com/dogs" id="dogs" class="ajaxLink">Dogs</a>

Then:

$('.ajaxLink').click(function (e) {
  location.hash = this.id; // get the clicked link id
  e.preventDefault(); // cancel navigation

  // get content with Ajax...
});​