Use one FCK Editor for several sites(domains)

How can I use one FCK Editor for several sites?

I have several sites
http://example1.com/
http://example2.com/
...

I want to use FCK Editor, which is stored at
http://repository.com/fckeditor/

Sites example1.com, example2.com are physically located near repository.com
and have full access to the resources of repository.com

I try to use editor for the sites http://example1.com/, http://example2.com/ ... this way:
<iframe id="uniqid___Frame" src="http://repository.com/fckeditor/fckedit ... ar=Default" width="700px"
height="300px" frameborder="0" scrolling="no"></iframe>
And it doesn't work.

But if I open the link in the browser
http://repository.com/fckeditor/fckedit ... ar=Default
FCK editor works properly.

Can you suggest a solution?