Add fixed domain to image path...

I am looking to add a fixed domain http://www.anything.com to the image path that is generated when an image is selected from the filebrowser and submitted with the WYSIWYG code.

I scoured the js code and must be overlooking something. Can anyone point me to the template in FCK where the domain can be simply added to precede the basepath etc. My goal is to permanently fix the domain to be similar to this:

http://www.anything.com/images/FCKeditor/...etc.

I'm sure its something easy, but its got me.

Thanks in advance.