User friendly urls in joomla1.5

I am working Joomla 1.5 . I am unaware of how to set user-fri开发者_JAVA技巧endly Urls to the site in Joomla1.5.

Give suggestions for keeping User-Friendly urls ...

I have changed the configuration for SEO as yes to apache mod_rewrite and Search engine friendly Urls .It changes the url as

http://localhost/joomla/Joomla_1.5.7/publicationsform but it shows me a 404 error and it works only when i put http://localhost/joomla/Joomla_1.5.7/index.php/publicationsform

how to resolve this . Also even when i put http://localhost/joomla/Joomla_1.5.7/index.php/publicationsform my css is not getting added..

You must have Apache mod-rewrite plugin enabled. http://docs.joomla.org/How_to_check_if_mod_rewrite_is_enabled_on_your_server