$(function() {

  // original margin-left of the bodywrapper and width of the sidebar
  // with the sidebar expanded
  var bw_margin_expanded = $('.bodywrapper').css('margin-left');
  var ssb_width_expanded = $('.sphinxsidebar').width();

  // margin-left of the bodywrapper and width of the sidebar
  // with the sidebar collapsed
  var bw_margin_collapsed = '.8em';
  var ssb_width_collapsed = '.8em';  

  function toggle_sidebar() {
    //alert('toggling!');
    if ($('.sphinxsidebarwrapper').is(':visible'))
      collapse_sidebar();
    else
      expand_sidebar();
  }

  function collapse_sidebar() {
    //alert('collapsing!');
    $('.sphinxsidebarwrapper').hide();
    $('.sphinxsidebar').css('width', ssb_width_collapsed);
    $('.bodywrapper').css('margin-left', bw_margin_collapsed);
    var sidebarbutton = $('#sidebarbutton');
    sidebarbutton.css('margin-left', '0');
    sidebarbutton.text('»');
    sidebarbutton.attr('title', 'Expand sidebar');
  }

  function expand_sidebar() {
    //alert('expanding!');
    $('.bodywrapper').css('margin-left', bw_margin_expanded);
    $('.sphinxsidebar').css('width', ssb_width_expanded);
    $('.sphinxsidebarwrapper').show();
    var sidebarbutton = $('#sidebarbutton');
    sidebarbutton.css('margin-left', ssb_width_expanded-12);
    sidebarbutton.text('«');
    sidebarbutton.attr('title', 'Collapse sidebar');
  }

  function add_sidebar_button() {
    //alert('adding button!');
    $('.sphinxsidebar').append(
        '<div id="sidebarbutton"><span>&laquo;</span></div>');
    var sidebarbutton = $('#sidebarbutton');
    sidebarbutton.click(toggle_sidebar);
    sidebarbutton.attr('title', 'Collapse sidebar');
    sidebarbutton.css({
        'color': '#FFFFFF',
        'border-left': '1px solid #133f52',
        'font-size': '1.2em',
        'cursor': 'pointer',
        'height': $('.document').height(),
        'padding-top': $('.sphinxsidebar').height() / 2,
        'margin-left': ssb_width_expanded - 12
    });
    $('.sphinxsidebarwrapper').css({
        'float': 'left',
        'margin-right': '0',
        'width': ssb_width_expanded - 28
    });
  }

  add_sidebar_button();
});