Error in functions.php

Hi all,

After searching for a plug-in that would allow me to list all category names and number of posts in each, I came across a piece of code that was supposed to be added to the functions.php – well … needless to say I had obviously done in incorrect, as now I’m getting an parsing error in the file and can’t view or do anything with the blog at all.

Will I be able to fix this simply by uploading and overwriting the functions.php file?

Thanks so much,
Jennifer