subdomain to user in ci ??

[eluser]mo2men[/eluser]
hi

i want make page to users that register in my site
to view data

so

if visitor go
www.site.com/page/user1
show data user1

www.site.com/page/user2
show data user2



that i wont like subdomain
www.user1.site.com/
but i wont that
www.site.com/page/user1

page = my controller

how i code this in my controller ?
and how i get user from model


sorry for my bad English but i wont help