Ajaxize 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)
New in 1.1: Context Awareness. Ajaxize is now setting the correct context for functions automatically. Special thanks to One Trick Pony for helping set the hook in the right place.