How to insert a image gallery into node body?
This may or may not work for you, try WYSIWYG FIELDS module. If it doesnt work, I cannot think of another turn-key solution.


  The Wysiwyg Fields module is bridge between CCK Fields and the Wysiwyg
  module, allowing most (if not all) CCK fields to be turned into a
  Wysiwyg button for a convenient inline solution.