The type of mouse you use should not matter. Sounds like a problem with the game (or DOSBox). A problem with how the game draws the cursor.

You could try some of unofficial versions of DOSBox:
DOSBox SVN Builds

They have fixes for known problems-

I've played through the game some time ago, i think with official DOSBox 0.72 on XPSP2 (SP3 wasn't out at that time, if memory serves), and didn't notice any problems with the mouse. Did you update the game? Look here for patches. Like MiniMax said, the type of mouse shouldn't matter in DOSBox - a mouse is simply a pointing device provided by the OS to DOSBox.

What OS are you using? Are you using any special mouse driver, or animated mouse pointers or something like that? What about other mouse-driven games in DOSBox, do they work?

Btw, i didn't even know there's a german JA. I guess the speech is still in the original english form, right? If it isn't, you're missing out bigtime on the nice and funny speech lines (; . Very often, german dubbing in games (especially older games) plainly sucks. One of my favourite examples, which i show often to friends in order to convince them to play games in english language, is "Day of the Tentacle" with it's horrible german dub.

Btw, i didn't even know there's a german JA. I guess the speech is still in the original english form, right?

No. There is a full german version of the game. Including speech. I have it too. But not the boxed version. Only the Bestseller Games cover CD version.

hi,
im using windows xp, sp2. I tried the patch for JA(just unziped the files in the JA directory) but then the message "ERROR: Problem reading CDRom. Please check" appears when i want to start. I think the patch wouldnt solve it anyway because i got the same problem with another game i tried (Game: "Tyrian"). Im using the official microsoft IntelliPoint mouse driver.
But its strange because the first time(after installation and without closing the dos window) there is a mouse, just if i want to start the another time i cant see the mouse.
I also tried to play the game at a computer of my friend(with PS/2 mouse), but same problem.
Maybe its the game itself? The game is from the magazine "PC-Games" but its a fullversion. If its the game, other games should work fine, but they dont.
please help, i really want to play that game.

Just a thought. Maybe this is no DOSBox problem. There are games that leave DOS in an unstable state when quitting. For example Netherworld. That game does not quit right. I had less DOS memory available and the next program that went into graphicsmode always crashed. Maybe JA has a similar problem.