Wrap selected text, keep HTML

Hi all!

I want to make a plugin that wraps the selected text. It has to preserve all html in the selected text.

This is my current solution:

FCK.InsertHtml('<a href="' + href + '">' + FCK.EditorDocument.getSelection() + '</a>');

But that erases every html element in the selected text, so if I would select "ab <strong>cd</strong> ef" the wrapped text would become "ab cd ef"

Please help! I have been googling and browsing objects in firebug for days now, with no result..

// Markus