Changed name in directory

I have found it necessary to change the directory name of my site.

Everything is working fine but if I go to change a block in the 'admin' it still looks to the old source editor.

Ie. It goes / looks to

/public_html/OLDSITE/plugins/tiny_mce/themes/advanced/source_editor.htm

and I need it to go to

/public_html/NEWSITE/plugins/tiny_mce/themes/advanced/source_editor.htm.

I have searched everywhere I can think of but cant seem to find where to change this.

Does anyone know please?

Hello

You need to remove cache files  from cache and cache_public folders. Don't remove .htaccess file from cache folder.