$(document).ready(function() {
 // hides the slickbox as soon as the DOM is ready (a little sooner that page load)

$('#container_hidden').slideDown('slow');
  
 // slides down, up, and toggle the slickbox on click    

  $('#slick-up').click(function() {
    $('#container_hidden').slideUp('slow');
    return false;
  });
});