Custom whitelist message and auto whitelist register on website

If a user joins my server and they are not on the "white-list" is there a way to display a custom message instead of "You are not white-listed on this server" can I make it something like "Please visit www.mywebsite.org to get whitelisted." ? Also if I can achieve that is there a way that when a user register on my website for them to automatically be white-listed on my server? That would REALLY help me with my greifer and hacker problems. It seems that "authme" is not so secure after all. Just recently a person used some kind of hack to not have to /login he just used my name and joined. Yes I have an offline authentications server and that is a risk but still...can someone please help me with this problem? That is the reason I want a register add to white-list thing.​

 

I suggest using the Craftbukkit-- or ++ builds on the spout forum, they add this feature natively, and majorly reduce lag!

 

craftbukkit-- ? and i already use craftbukkit++ you think i am a bad server admin? i already researched craftbukkit++ eons ago....it is THE only bukkit build i use

 

WhiteMessage (? I think that's the name) let's you do this.

And also... Bukkit no support offline!