I've downloaded the mysql server,
I downloaded the mclawl package
I port-forwarded
I downloaded minecraft.jar (the 1 where it gives u the login screen when u click it. there seems to be several versions, and i'm hoping its the right one.)
I placed minecraft.jar in the lib folder
i use run.bat
I get an error saying 

at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.define..........

i'm too lazy to type in the rest, but the lines mostly start in: at java

then it says it cant find main class: Main

Error:Minecraft failed to start.

 :/

Any help would be appreciated.

I tried using older versions of the minecraft jar, and that didnt work.

I updated my java 32 and 64 bit, but that didnt seem to do it either.

Please help