I was unable to do so, as I did not find out how to check if the situation is Logged In or Logged out.
But I found a way through css with the classes defined in the script:
.qa-nav-user-item {display:inline; margin-left:6px;} <<<<< no float !
Then adding these classes:
.qa-nav-user-account{float:left;}
.qa-nav-user-login{float:left;}
.qa-nav-user-register{float:left;}
.qa-nav-user-logout{float:right;}
.qa-nav-user-Facebook{float:right;}
So the Facebook button is always in the upper right, should work on the original theme as well..(I hope)
It is not very elegant, but may be someone finds it helpful..
monk333