5 Apps with the same CI 2.x installation... justo one CSS folder ans JS folder

[eluser]CroNiX[/eluser]
As InsiteFX eluded to, you didn't include the subdirectory (ci21test) in the href of your link.
You say it's:

Code:

http://localhost/ci21test/css

But your link is written as if it's

Code:

http://localhost/css

If your base_url is

Code:

http://localhost/ci21test/ (supposed to have trailing /)

You should write:

Code:

<link type="text/css" href="<?php echo base_url('css/jquery-ui-1.8.18.custom.css'); ?>" rel="stylesheet" />