Re: Minecraft.jar problems
From a terminal, run minecraft and post all of the output. Also what version of java are you using?
When you paste back the output, be sure to wrap it in code tags for readability. Adjust the part in read to the actual location of minecraft.jar, you can also just drag it into the terminal window and the path will be copied in.
java -jar /path/to/minecraft.jar
"You can't expect to hold supreme executive power just because some watery tart lobbed a sword at you"
"Don't let your mind wander -- it's too little to be let out alone."