(keitai-l) storing info in the scratch pad - how to do?

Hello all, I have a simple question:

I have noticed that when I download some jar files, when I execute them, 
the scratch pad is created. Now I need to store some images and sounds 
in the scratchpad, since the mobile's memory for the application is not 
enough for that. Until now I have used this:

mi = MediaManager.getImage("resource:///file.jpg");

But with that method the files -I think- are stored in the jar file, so 
I have only 30k. The question is, how can I get a pack of images stored 
in the scratch pad in order to use them in my program? Is the scratch 
pad a different file that you must download or is it created from the 
jar? How can I control this.

Any help will be appreciated, thanks very much.