Multiple Drupal Sites one FCKEditor?

i have four drupal sites in the same host.

something like:
ht_p://www.myhost.com/site1
ht_p://www.myhost.com/site2
ht_p://www.myhost.com/site3
ht_p://www.myhost.com/site4

and i have the modules install like this:

ht_p://www.myhost.com/site1/modules/fckeditor
ht_p://www.myhost.com/site2/modules/fckeditor
ht_p://www.myhost.com/site3/modules/fckeditor
ht_p://www.myhost.com/site4/modules/fckeditor

but i dont want to put the fckeditor 2.6 four times in the sub-directory, i want to put somewhere like ht_p://www.myhost.com/fckeditor

can i do this???

thanks