retrieving an editor instance

Hello,

I'm trying to interact with the instance of my editor from an external script.
In order to do this, I first try to retrieve the instance by simply calling FCKeditorAPI.GetInstance method.

But when I try to execute the code, I get the following error from firebug:

FCKEditorAPI is not defined

My code:

1 <script>
2 var oFCKeditor = new FCKeditor('page_content');
3 oFCKeditor.BasePath = "/javascripts/FCKeditor/";
4 oFCKeditor.Config["CustomConfigurationsPath"] =
5 '<%= javascript_path "railsfck.js" %>';
6 oFCKeditor.ReplaceTextarea();

7 window.test_fun = function get_form_values() {
8 var oEditor = FCKEditorAPI.GetInstance('page_content');
9 var html = oEditor.GetHTML();
10 alert(html);
11 }
12 </script>
...

13 <%= link_to_remote 'Apply', :submit => 'editform', :update => 'content',:before 14
=> "diff_launch();test_fun();" :url => {:action => 'process_edit'} %>


after have substituting line 4 with the following line of code

var oEditor = FCKEditorAPI.GetInstance('page_content');

I get the following error from firebug:

window.parent.InnerDialogLoaded is not a function
unescapeHTML: function() {..}


Does anyone know where is the problem?
Please note that I'm using ajax link_to_remote call.

Thanks you in Advance.

Indusha