- if you really wanted "animals" and "cars" owned by separate users, then you should just do http://myip/animals/ and http://myip/cars/. That's left for you to figure out though.
...sorry i can't figure that out... that's why i came here looking for clues, not being a web admin or anything.
my only guess is that you would have to set up some kind of redirect from a main page. but i don't know enough about either that level of html or about relative path names to figure that out.
i've already run into problems trying to link to images outside of the sites folder (even in the ~/Pictures/ directory!) with relative pathnames and apparent lack of privs.