how to config expires in Lighty

[megatrue]

Hello, I have problem with Lighttpd Expires Configuration.

hier is my expires.conf

expire.url = ( "/clientscript/" => "access 1 months" )
$HTTP["url"] =~ "^/images/" {
expire.url = ( "" => "access 1 days" )
}

but after test , only .js script be cached. Why? Anyone knows it?

[Dismounted]

<a href="http://redmine.lighttpd.net/wiki/lighttpd/Docs:ModExpire" target="_blank">Have a look at the Lighttpd Documentation.</a>