Best way to programatically add “rel” attributes to page and post images

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For single posts and pages, I would like to add certain rel attributes to all the images on the contained therein added with the “Add Image” functionality on the edit screen.

The attribute would be rel="lightbox[post id]"

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What function would I filter to accomplish this most effectively?

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2 comments

  1. image_send_to_editor

    function insert_img_rel_attrib( $html, $id, $caption, $title, $align, $url, $size, $alt )
{
  /* Run your magic on the image $html to insert rel attrib */
  return $html;
}
add_filter( 'image_send_to_editor', 'insert_img_rel_attrib' );