Greetings. I'm attempting to display a collection of thumbnails of the main image(s) associated with posts. The Codex details the use of the_post_thumbnail() but this depends on a picture being designated the Featured Image (in the upload dialog). My present theme uses postimage(a,b) to display the first photo inserted into a post in the dimensions chosen (a=width, b=height in pixels).
I can't find a reference to postimage() either in the Codex or Functions documentation. What I'd like you to help me with is whether this is a native WP function or one that may be in a plugin. The theme, BranfordMagazine by Michael Oeser does not depend on any plugins for its basic use and I haven't installed any of the plugins that google says use a function called postimage().
So again, is postimage() located within WP or is it deprecated? It works in the theme I'm trying to develop but so far the pages depend on the basic scripting of BranfordMagazine. Thanks for your help.