Problem with editor.insertHtml

Hello,

I am try to write a plugin for CKEditor, but maybe there are two problem when I use "insertHtml" to insert <img> and <a> tags:

1. I cannot insert a tag with title:

editor.insertHtml('<a href="http://google.com" title="Something">Google</a>');

The generated code is:

<a href="http://google.com">Google</a> (title attribute doesn't appear)

2. I cannot insert <img> and <a> tags when I remove the default "image" and "link" plugin:

Because of some reasons, I want to replace the default "image" and "link" button on toolbar, but my plugin cannot insert <img> and <a> tags when I remove the default plugins.

Are there some solutions for me ? Thank you very much.