yoav.aner

<a href="http://blog.gingerlime.com/ajaxizing/" title="WordPress plugin that allows you to ajaxize almost any php function on your site" rel="nofollow ugc">Ajaxize</a> will allow you to ajaxize almost any php function on your site. 
It can be a plugin, a function you wrote, or even a core wordpress function.
1.4 : Removed deprecated split function 
 Added an option to remove Ajax referer protection (not recommended, but helpful in some rare cases) 
 Tested for compatibility with WordPress 4.x
1.3 : Updated to work within 404 templates (thanks to ovidiubica for reporting)
1.2 : Small security improvements (added nonce to the javascript) and tested with WordPress 3.2.1
New in 1.1: Context Awareness. Ajaxize is now setting the correct context for functions automatically. Special thanks to <a href="http://digitalnature.eu/" rel="nofollow ugc">One Trick Pony</a> for helping set the hook in the right place.

Ajaxize

Ajaxize will allow you to ajaxize almost any php function on your site.

Konstantin Obenland

This plugin lets you specify a header image for each post, page, custom post type or archive page individually, from your default headers and custom headers.
It adds a meta box in the post edit screens with the header selection and a settings field in the edit profile and each taxonomy edit screen. 
If no specific header is specified for a post it will fall back to the default selection. 
There is no change of template files necessary as this plugin hooks in the existing WordPress API to unfold its magic.
Thanks to Erik T. for the idea to this plugin!

WP Display Header

This plugin is not compatible with WP version 4.8.1.

Not compatible

Select a specific header or random header image for each content item or archive page.

Ajaxize vs WP Display Header