You need to have "timer.jar" in your classpath and "timer.dll" in your working directory or path. For example, if you have a project folder like this:
MyGame
--bin
-timer.dll
-(classes)
--src
-(.java files)
--lib
-timer.jar
You'd launch your game like this:
c:\MyGame\bin> java -cp ../lib/timer.jar;. com.whatever.MyGame
You'll note how the timer.dll file is in the "bin" directory where the game is started from. Does that help?