[jQuery] Need help with jQuery in Wordpress

[zek]

I've been putting the finishing touches on my blog-to-be, but I've got
stuck on this thing and I need help!

This is what I'm trying to create: When you click on a thumbnail on
the bottom, the main image and the text are supposed to change.
[IMG]http://i34.tinypic.com/i6xzxd.jpg[/IMG]

Here's the site: http://zek.nma.sg/ (with the broken attempt at
creating the above)

This is the code I used:


$(document).ready(function(){

    $("h3").append('<em></em>')

    $(".thumbs a").click(function(){

      var largePath = $(this).attr("href");
      var largeAlt = $(this).attr("title");

      $("#largeImg").attr({ src: largePath, alt: largeAlt });

      $("#recentworks h3 em").html(" (" + largeAlt + ")"); return
false;
    });

});

I was trying to follow the tutorial at 
http://www.webdesignerwall.com/tutor...for-designers/
(See No. 9)

I've tried deactivating my Flickr+Highslide plugin, and I still
couldn't get the jQuery to work. I checked with Firebug, and I'm
pretty sure the jQuery loads into the browser. But I can't get any
code working.

How do I get the jQuery to work?