Daan and BC - Try this link. I works really well, easy to reverse, no risk of lost save files:
Easiest way to downgrade your Minecraft and then upgrade it again... so easy...
http://forum.cfew.us/showthread.php?tid=272
Yes working on new v1.2.4 release before 'Jeb' strikes us with v1.2.5
Easiest way to downgrade your Minecraft and then upgrade it again... so easy...
http://forum.cfew.us/showthread.php?tid=272
Yes working on new v1.2.4 release before 'Jeb' strikes us with v1.2.5