Get Image on Post Using Custom Fields

Hello, Thanks for viewing my thread!

I just want to know how to get the Image of the post and display it on the archive?

Currently my theme use timthumb to generate thumbnail and I want to eliminate it permanently.. My theme supports custom field named “thumb” so you can customize the thumbnails.. My question is how to call it on archive?

Currently the code on my archive.php is this: (using timthumb)

” rel=”bookmark”><img src=”<?php bloginfo(‘template_directory’); ?>/includes/timthumb.php?src=<?php get_thumbnail($post->ID, ‘full’); ?>&h=100&w=100&zc=1″ alt=”<?php the_title(); ?>” />

How to change it so it will use the custom field “thumb” instead using the timthumb?

Thanks!