Today i will explain you where your "screenshotJPEG" are arrive on Windows XP/Vista.

First, its important to make sure you have "show hidden files" ON!
You can change this in every Folder Window:
Go to "Extras -> Folderoptions -> View -> "Extended Settings" Part -> "Hidden Files and Folders" Part -> Set a mark on "All Files and Folders".

Now you can go on like this:

%foldername% = hidden folders
<foldername> = variable

Windows XP:
<SystemHDD>:\Dokuments and Settings\<user>\%Application Data%\OpenArena\<modfolder>\screenshots

Windows Vista
<SystemHDD>:\Users\<user>\AppData\Roaming\OpenArena\<modfolder>\screenshots

The second way to find your pics looks like this: Search for files like: "shot0001.jpg" or "shot0002.jpg" etc...

All the best
Obama

On Linux:

/home/<user>/.openarena/<modfolder>/screenshots/