codeigniter broken link

[eluser]schiller[/eluser]
I'm new in codeigniter. i have a project running perfectly in my localhost. when i deployed, my links seem to be broken. e.g. mysite.com displays the homepage without any error. now, i have a link let's say an about us link e.g. mysite.com/main/about where main is my controller and about is my function. the problem is the about us link is broken e.g. "Oops! This link appears to be broken." i am also sure that i uploaded the htaccess. do you have any idea where did i go wrong? thank you for any positive response.