insertHTML from outside plugin

Hi everyone it is my first post on this board, I searched for this but was not able to find the answer.

I created a plugin for my site that loads a modal and inside that modal it displays all of that users images. From this point I want to bind a function to clicking that image that would insert the html into the current ckeditor instance. With TinyMCE I bind the following coffee script function

insertImageIntoTinyMCE: (image) ->
   tinyMCE.execCommand('mceInsertContent',false,image)

For CKEditor I thought it would be something like the following, but it didn't work...

insertImageIntoCKEDITOR: (image) ->
   CKEDITOR.execCommand('insertHtml',image)

Not sure how I access the CKEDITOR instance to inject that HTML. Any suggestions? Let me paste my plugin code below:

CKEDITOR.plugins.add('images',
{
  init: function(editor)
  {

    var $mediaBrowser;
    $mediaBrowser = $("<div><div class='loading-dialog' style='width:inherit; height:inherit'></div></div>").dialog({
      title: 'Insert Image',
      modal: true,
      autoOpen: false,
      height: 400,
      width: 600
     });

    editor.addCommand('insertImage',
    {
      exec : function(editor)
      {
        $mediaBrowser.dialog("open");
        $mediaBrowser.load("/documents/get_images_ckeditor");
      }
    });

    editor.ui.addButton('Image',
    {
      label   : 'Insert Image',
      command : 'insertImage',
      icon    : '/images/application/icon_16_picture.png'
    });

  }
});