Ok, thanks.
What I've made:
1) Created a clone from PRS+ online with help of Google-command
2) Downloaded this clone with tortoise onto my PC in a new repository-folder
3) Altered/overwrited files in this folder with my contributions
4) Deleted all unaltered files
5) commit
6) synchronized --> looks good so far
So all ALTERED/ADDITIONAL files can be found here:
http://code.google.com/r/josefmichal.../source/browse
A.