Display a view in an overlay?
The best solution I can think of for Drupal 6, would be to add some custom JavaScript to that page that scans all the links and attach a click handler on the links that matches the desired URL. Something like this:

$("a").each(function(){
  if (this.match('/bookmarks$/')) {
    $(this).click(function(){
      $.get(this.href, function(result) {
        $(result).find('#some .element').dialog();
      });
      return false;
    });
  }
});


The above code is written from memory, so is untested and probably flawed, but is can give you an idea of how to do it. The code requires jQuery UI dialog plugin to be loaded.