I'm trying to add to my images "class=pinthis" to only certain post categories.
I know I should be doing this through functions.php but can't figure out where to hook.
Basically any image (except maybe if the class contains wp-smiley) in a post with a category of "Cooking" I want to append the "pinthis" to whatever is in the <img class="xxxx" ..... IE <img class="xxxx pinthis" where xxxx was whatever was there before.
All other posting categories I want to exclude from adding this class.
Thanks!