Codex instructions on adding Drop Cap quick tags

I touched on quick tags in another thread I started, but this warrants its own thread.

Following the instructions on this page, I tried to create a quick tag for drop caps:

http://codex.wordpress.org/FAQ_Layout_and_Design

The instructions are about a fourth of the way down the page. This is what it says to add to my /wp-includes/js/quicktags.js file:

edButtons[edButtons.length] =
 new edButton('ed_capdrop'
 ,'CapDrop'
 ,'<p id="fp">'
 ,'</p>'
 ,'c'
 );

My website isn’t live, so you won’t be able to take a look. I just pasted it into the file and successfully uploaded the code. But I can’t find a new button when I try to create a new post.

Could someone take a look at the above code and let me know if it looks okay? I’m wanting the first letter of each post to be a drop cap. Currently I’m using HTML that I add by hand to each post.

Thank you!!