so i have been playing with the new update but there is one problem: the friendly players server isn;t on the new update!!!!! so please if there is an admin on then please update it! i want to play on the server!
thanks

The FP Minecraft server uses craftbukkit, and there are currently no 1.5 craftbukkit builds released.

You can revert back to Minecraft 1.4.7, or you will just have to wait for an update from the bukkit team.

Latest versions of craftbukkit: Here

but how do i revert minecraft back?

If you kept a 1.4.7 version of Minecraft you can use that, otherwise you can try downloading a program called MCNostalgia which should allow to revert to any version of Minecraft ever released.