RewriteEngine on
RewriteBase /
RewriteCond $1 !^(index\.php|images|robots\.txt|assets|uploads|thumbs|$|demo|img|event)
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

php_value upload_max_filesize 10M
php_value post_max_size 10M

This solution works even in  shared server.

• http://stackoverflow.com/questions/2184513/php-change-the-maximum-upload-file-size