[jQuery] Why won't this "unbind" work?

[Rick Faircloth]

Given these scripts:

$(document).ready(function() {
     $('#myTextarea').hide();
});

$(document).ready(function() {
     $('#hide').click(function() {
          $('#myTextarea').unbind().slideUp();
          return false;
     });
});

$(document).ready(function() {
     $('#show').click(function() {
          $('#myTextarea').expandable().slideDown();
          return false;
     });
});

and this HTML:

     <p>
        [ <strong>Notes concerning textarea</strong> ]
        [ notes ]
        [ <a id="hide" href="#">hide</a> ]
        [ <a id="show" href="#">show</a> ]
        [ export ]
        [ clear ]
     </p>
        
     <textarea id="myTextarea" cols="100"></textarea>
        

Why won't this code unbind the .expandable function?
(.expandable is a reference to the .expandable plug-in)

Thanks for any input...

Rick