help with a simple test

help with a simple test

I am trying to learn this jquery stuff. So i thought i would start with a simple test. I have tried many variations and cannot get it to work

I have downloaded the library version jquery-1.2.6.js and I am trying a simple slidedown for one link but when i run the page, nothing happens. I do not get any errors. this is the version I currently am trying. can you explain what I am doing wrong?

<html>
  <head>
    <script type="text/javascript" src="jquery-1.2.6.js"></script>
    <script type="text/javascript">
$(document).ready(function(){
$(".a").click(function(){

$("#link").slideDown("slow");
});
});

   
    </script>
   <style type="text/css" >
   #link
   {
      width:150px;
      height:200px;
   }
   </style>
  </head>
  <body>
   <div id="link">
    <a class="a" href="#">test</a>
   </div>
  </body>
  </html>