function toggle_sidebar_section(id, header) {
  sidebar_section = document.getElementById(id);
  sidebar_toggle_link = document.getElementById(id + '-toggle');

  if (sidebar_toggle_link.className == 'metadata-collapse') {
    sidebar_section.style.display = "none";
    sidebar_toggle_link.className = 'metadata-expand';
    sidebar_toggle_link.title = 'Expand this section';
    sidebar_toggle_link.innerHTML = '▶  ' + header;
  }
  else {
    sidebar_section.style.display = "block";
    sidebar_toggle_link.className = 'metadata-collapse';    
    sidebar_toggle_link.title = 'Collapse this section';
    sidebar_toggle_link.innerHTML = '▼  ' + header;
  }
}