function twentyfourteen_post_nav() {
    // Don't print empty markup if there's nowhere to navigate.
    $previous = ( is_attachment() ) ? get_post( get_post()->post_parent ) : get_adjacent_post( false, '', true );
    $next     = get_adjacent_post( false, '', false );

    if ( ! $next && ! $previous ) {
      return;
    }

    ?>
		<nav class="navigation post-navigation" role="navigation">
		<h1 class="screen-reader-text"><?php _e( 'Post navigation', 'twentyfourteen' ); ?></h1>
		<div class="nav-links">
			<?php
      if ( is_attachment() ) :
        previous_post_link( '%link', __( '<span class="meta-nav">Published In</span>%title', 'twentyfourteen' ) );
        else :
          previous_post_link( '%link', __( '<span class="meta-nav">Previous Post</span>%title', 'twentyfourteen' ) );
          next_post_link( '%link', __( '<span class="meta-nav">Next Post</span>%title', 'twentyfourteen' ) );
        endif;
        ?>
			</div><!-- .nav-links -->
		</nav><!-- .navigation -->
		<?php
  }