Grade F on Add Expires headers

[deluxmall]

I check YSLOW and it indicate that I have the following, how can I add a far future expiration date for the following?

There are 7 static components without a far-future expiration date.

* (2011/3/25) http://www.google-analytics.com/ga.js
* (2011/3/24) http://xxx.com/clientscript/vbulletin_global.js?...
* (2011/3/24) http://xxx.com/clientscript/vbulletin_menu.js?...
* (2011/3/24) http://xxx.com/clientscript/ncode_imageresizer.js?...
* (2011/3/24) http://xxx.com/clientscript/advanced_forums.js
* (2011/3/25) http://pagead2.googlesyndication.com/pagead/show_ads.js
* (2011/3/24) http://xxx.com/clientscript/vbulletin_read_marker.js?...