codeigniter : anchor link not working in localhost but index page executes fine

Question

I downloaded a old webpage from webserver. now i am redesign all pages. while testing the links get back to localhost content page. but it works fine in web server.

in localhost index page works fine but from index page links are not working. while click links the url shows fine like

http://localhost/sitename/site/index

anchor code in home page is :

<?php echo  anchor(base_url().'site/index','Home','class="header"');?>

in config.php

$config['base_url'] = 'http://localhost/sitename/';
$config['index_page'] = '';

in controller (site.php):

class Site extends CI_Controller    
{
public function __construct()
{
    parent::__construct();
    $this->load->helper('url');
    $this->load->helper('form');    
    $this->load->helper('html');        
}

public function index()
{       
    $this->load->view('site/home');     
}
}

.htaccess page on www/site-folder-name

     <IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteCond %{REQUEST_URI} ^system.*
    RewriteRule ^(.*)$ /index.php?/$1 [L]
    RewriteCond %{REQUEST_URI} ^application.*
    RewriteRule ^(.*)$ /index.php?/$1 [L]
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
    ErrorDocument 404 /index.php
</IfModule>

if u want any other detail i will give u....

Answer 1

Modify your Htaccess

RewriteEngine on
RewriteBase /project_name
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteRule ^(.*)$ index.php/$1 [L]