MOB's, Packages, DoubleBuffering, & Distribution

Question

1. Moveable objects. Namely, animated gif files. I simply want them to move across the gui from point a to point b (to look as if they are 'moving'). Are there any links or better keywords to help me search for answers to this? Saw some references to double bufferring in regards to this too, but I don't know what that is either.
2. Packages. Ok, I have a proggy w/lots of files and got it to work just fine. But to do so, I had to move the class w/the main method into a directory other than the directory where all the other class files were. Its like this:
c:\mainDirectory\MainFile.java
w/the rest in:
c:\mainDirectory\Bin\*.java
All the ones in the Bin directory are of package Bin.
The main file has - import Bin.*
The classpath includes c:\mainDirectory
This proggy will get only more complicated, because I want to use other directory names and other packages so as to keep everything nice and separated by subject matter. But my not knowing why the main program file won't work if its located in the Bin directory worries me, and I don't wanna paint myself into a corner is all.
3) Distribution. Lets say I make a program (application). Jar it up. Now I want people to be able to download it and run it, fairly easily. So I'll just link to the latest SDK on my site, and once they have that they can just double click on the jar file to install it.
Not having done this before, my question is: what then? What does the user, now that the proggy is installed, do to run the program? I can't ask my user to set a classpath and run java filename. Will I need to make a separate sort of gimmick file for each operating system, a .bat for windows, or a shortcut, and whatever for linux, etc... or is there a platform independant way to make it so they can just click on something to get it to run?
4)I'm using 1.3, gonna get the 1.4 beta soon. I noticed in 1.3 a problem, at least on my system (win98SE). In windows w/scrollbars, upon scrolling, the text will get garbled until I click in the window. The one program I saw get around this was a JEdit plugin which adds mousewheel support to JEdit, and has an option to fix 'flickering' as it calls it, which happens to fix my problem.
So my question is: does 1.4 have this problem still? (my internet connection is woefully bad, so it's gonna be an all day thing to download it, which is why I haven't yet). I ask, because if so, it'll be worth my time to check out the open source JEdit plugin to see how they solved the problem, then do something similar in my gui's. But if not, then I can just get my users to download the 1.4 beta and they won't have the problem, and no additional code will be needed from me.
Thanks in advance, any help is appreciated.

Answer 1

ok, I solved number 2, part of number one, and none of number 3.
#2. solved. the packages problem. when ya 'java filename' the main file, ya have to put the directory/package name of the file before the filename, so:
java javaprojects.myproggy.filename
for some reason, I have to do this even if the directory is in the classpath and I don't have to do such w/the rest of the files in that directory.
#1. partially solved: moving objects problem. Found some info on how to 'double buffer'. Which they say gets rid of the flickering problem. But I still don't know how to make a graphic appear to 'move' across the screen.
#3 not solved at all. Distribution, still don't know how this works exactly.