help with going back to 1.1

I have the 1.1 jar file but when i put it in the .mincraft folder it still launches 1.2
and i tried using MCnostalga but it keeps saying error and that my minecraft is not vinalla and tells me to delete my bin folder and launch minecraft but that doesnt work so i just need help on puting the 1.1 jar file back into place
Please and Thank you

 

I did but when i launch minecraft it starts up with 1.2.3 and it doesnt even update

 

please help

 

i have but this is the error that pops up
Error: The file in c:\users\nan\appdata\roaming\.minecraft\bin are not for the current version or are not vanilla. Please delete your .minecraft bin folder and run the launcher again to get a vanilla minecraft of the current version.
And i do delete the bin folder and launch again but i still does not work

 

k Thank you for trying

 

YES, i fixed it