.htaccess baseurl

[eluser]dexter21[/eluser]
Hi i have following site estructure

/codeign
/several
how could i do with .htaccess that if i type www.mysite.com go to www.mysite.com/codeign ?

i have .htaccess:

Code:

RewriteCond $1 !^(index\.php|imagenes|js|descargas|tmp|public|robots\.txt)
RewriteRule ^/codeigniter/([^/\.][^\.]?)$ /codeigniter/index.php/?$1 [L]

many thanks