Output posts attached images as thumbnails linked to full-size with lightbox class

Thanks to @Rarst who led me in the right direction to answer this question!

What do you get if you var_dump() return of what doesn’t work,
especially wp_get_attachment_img_src()? Do you have WP_DEBUG enabled?
– Rarst

function product_images() {
global $post;
    $attachments = get_posts( array(
        'post_type' => 'attachment',
        'posts_per_page' => 0,
        'post_parent' => $post->ID,
        'exclude' => get_post_thumbnail_id()
    ) );

    if ( $attachments ) {
        // $content needed to be just = not .= to start out the variable
        $content="<div class="productimgs">";
        foreach ( $attachments as $attachment ) {
            // The correct function to retrieve the needed URLs
            $imgthumb = wp_get_attachment_image_src( $attachment->ID, 'thumbnail' );
            $imgfull = wp_get_attachment_image_src( $attachment->ID, 'full' );
            $content .= '<a class="thickbox" href="'.$imgfull[0].'"><img class="productimg" src="'.$imgthumb[0].'" /></a>';

        }
        $content .= '</div>';
    }
    // Most importantly, this needed to be an echo not a return
echo $content;
}

Thanks again Rarst for leading me to the answer!

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