HELP! Very bad mistake regarding dock

How do I get my dang dock back to normal? I tried installing a new dock from some site (leoparddocks.com I think) and I either did it wrong or it didn't work (most likely I did it wrong) and now I can't get it back to normal!

Anybody know what I should do (other than system restore if at all possible)?

you just tried to replace the background of your dock right? and you did not backup your original background files first.
no problem.
download the original background files
http://www.mediafire.com/?9ojd21zmvvt
run the workflow found on leoparddocks.com
and select the file you just downloaded

your leopard dock shold now be back to normal
let me know if you need more help