JS-newbie trying to get jQuery to work

JS-newbie trying to get jQuery to work

First off: I don't have any experience with JavaScript. I've been trying to follow a few tutorials on tabbed navigation, but I just can't get them to work.

The last one I tried was this one: http://apricotstudios.wordpress.com/200 ... -tutorial/

I'm running it on a local wordpress installation. I've included this in the header:

   <script type="text/javascript" src="jquery.js"></script>
   <script type="text/javascript">
   $(document).ready(function(){
   $('#mainBig div').hide(); // Hide all divs
   $('#mainBig div:first').show(); // Show the first div
   $('#mainBig ul li:first').addClass('active'); // Set the class of the first link to active
   $('#mainBig ul li a').click(function(){ //When any link is clicked
   $('#mainBig ul li').removeClass('active'); // Remove active class from all links
   $(this).parent().addClass('active'); //Set clicked link class to active
   var currentTab = $(this).attr('href'); // Set variable currentTab to value of href attribute of clicked link
   $('#mainBig div').hide(); // Hide all divs
   $(currentTab).fadeIn('slow') //fade in target div
   return false;
   });
   });
</script>


And this is the html:

<div id="mainBig">
      <h3 class="main big">V&aelig;rstatistikk</h3>
      <ul id="tabMenu">
         <li class="temperatur"><a href="#temperatur">Temperatur</a></li>
         <li class="nedbor"><a href="#nedbor">Nedbør</a></li>
         <li class="lufttrykk"><a href="#lufttrykk">Lufttrykk</a></li>
         <li class="fuktighet"><a href="#fuktighet">Luftfuktighet</a></li>
         <li class="straling"><a href="#straling">UV-strÃ¥ling</a></li>
         <li class="diverse"><a href="#diverse">Diverse</a></li>
      </ul>
         <div id="temperatur"><? include "weatherlink/stats.htm"; ?></div>
         <div id="nedbor"><? include "weatherlink/stats.htm"; ?></div>
         <div id="lufttrykk"><? include "weatherlink/stats.htm"; ?></div>
         <div id="fuktighet"><? include "weatherlink/stats.htm"; ?></div>
         <div id="straling"><? include "weatherlink/stats.htm"; ?></div>
         <div id="diverse"><? include "weatherlink/stats.htm"; ?></div>
   </div>


And nothing happens. It's as if there were no js files. I've checked that the sources are correct. What am I doing wrong?