how to redirect from CI index.php to folder/index.php?

[eluser]qwertyjjj[/eluser]
[quote author="porquero" date="1329408020"]Well, I see that you need known more CI.
I recomend you read the tutorial. It help you to understand CI.


http://ellislab.com/codeigniter/user-gui...index.html[/quote]

I've read it but that doesn;t mean pratical experience of.
Is there a section on redirecting?
There's not really anything in the manual covering integration with existing sites.
The default controller is welcome.php so in the index function I put:
redirect('/catalog/', 'refresh');

However, that just shows a blank page at http://localhost
It should show localhost/catalog/index.php and that index.php page is not MVC it is OSCommerce code.