problems with "su"

Recently, I have been fooling around with programming, and fuxing with adding and deleting things from binaries, well...i accidentaly deleted my su program, but luckily I had already backed it up in my home directory. When i replaced the file to its proper place (/bin/su) i could no longer enter root status from my normal user account. Whenever i typed su, then my password, it would always tell me that i have typed the incorrect password. What should I do?

have you tried loggin in under single user, and changing making a new root password?

if all else fails...recompile su...

ok...meethinkz that im going to recompile. What is the su package called, or where can I download the source from?

Use sudo instead of su.

Check the /etc/sudoers file. If it doesn't exist, then you should create it:
touch /etc/sudoers

then you need to edit it:
visudo

Links
http://www.siliconvalleyccie.com/linux-hn/sudo.htm