Server Error - Please help

Hi Guys,

I am hoping someone can help me on my server error(s).

Error #1 ) I have premium minecraft but my friend has cracked/offline version, So I would like to put my online-mode to offline. But my server keeps making a new Server file so I cant make it offline. Please help?

Error #2 ) I Have a Bukkit server, and When I put plugins in the folder and run my .bat file, Everything loads but then closes everything (My Server file is online-mode=false). Please help?

- Many Thanks