to identify if we are on blog index or detail page.
When on detail page: On page load, the header slideshow is hidden, allowing
for JS at bottom of page to update the image and then show main image in
header slideshow without flashing content while image is updated.
*/
var el = document.querySelector('body');
var className = true ? "blog-detail" : "blog-index";
if (el.classList) { el.classList.add(className); }
else { el.className += " " + className; }
