I often use the Closure Compiler at http://closure-compiler.appspot.com/ (online) and http://code.google.com/closure/compiler/ (offline)

Many thanks! I've just found a simple tutorial of how to use it in Python script: http://code.google.com/closure/compiler/docs/api-tutorial1.h...

So, I've written my own script, which minified seven js-files with total size 84.8 KB to one file with size 26.7 KB. Plus gzip and it will be very small.

Thanks again.