Load an AJAX submission enabled webform using another AJAX call
Try to create ajax links with this module Ajaxify Drupal with JQuery Ajax.

It will load all ajax behaviour of loaded content(if loaded content contains ajax enabled form then that also)


  Ajax links API module help you to load any content to a specified DIV or ajaxify whole drupal site, using JQuery Ajax. This module will also load JS for Ajax-loaded content by using Drupal.attachBehaviors(). In case you dont want to load js or css, you can alter tpl for path/node type.