Disk cache javascript functions and images

Hi,
How can I force client browsers of my web application to cache the images and other javascript entities like css, functions, js files, etc.
By default it is not caching, though it should have. I have not written any code saying not to cache. Any help.
Environment : Tomcat server - java beans - jsp [struts framework]
In Netscape 7 if I say 'page view' it shows images and media files of my applications are not cached. Thats why application is really slow. If I compare this to some other web application which is fast, I see that media files, js files and images gets 'DISK CACHED'.]
Can anyone explain me what is disk cache and how to get it disk cached?
Thanks,
sunil

Thanks. I now understand whats the concept of disk cache.
But after lot of analysis also my problem still remains the same. Just that there are some patterns available.
I have some images in my own application. I also have some images which reference another site [application]. Interestingly all images which reside in my appication are not getting cached. All image which I refer into other site are getting cached. Can anyone makeout anything from this?
I looked into META tag generated for resulting htmls. But they dint have anything which says browser not to cache.
Can anyone list any java/jsp/html instructions which can tell browser not to cache stuff.
Or more importantly is there any setting or instruction or command which I can write in my java/jsp/html which can override any such setting done.
Thanks,
Sunil

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