JQuery :: Structuring A New Plugin?

I'm in the process of developing a new plugin but the way I have structured the codes doesn't seem quite right to me so I'm hoping someone might be able to offer a better way to do it.

The plugin itself has different behaviour if called on different types of elements (images, divs etc) with a range of shared functions used across all element types.

This is the basic structure I have so far:

(function ($) {
$.fn.editable = function (options) {
var defaults = {
// default value declarations

[Code].....

The reason it does seem right to me is because any instance of the plugin called on a div will also contain all the code that is used if it was an image even though the code won't be used.