InsertHTML method is duplicating inserted txt

Hello I have a CMS and it links the pages like /?p=pageName so to aboid typing all code and try to remember page names. I created a plug in that reads the CMS available pages and generates the appropiate code. I use the Placeholder plugin as a base. And now the program works perfect!.

But I noticed a "bug" on it, ok when I want to add a link to any text, simply I select the text, (lets say "link") and then click on my plugin icon in the editor (Yellow P).

I type the page link and contents. When I click the ok button the link is added perfectly...

the problem becomes when I select the link again (or place the cusor on it) and do the same process again the "link" text now says "linklink". If i do the same thing now says "linklinklinklink" and so on...

I followed this tutorial, word by word... even if you do it it will beheave like Im telling you.
http://sourceforge.net/forum/forum.php? ... _id=257180

I noticed and think the problem is in FCK.InsertHtml on the FCKInsertLink.Add function. If the selected text has no ancestor node <A> it works. the problem is when it has it.

I hope you can help me

Thanks!!