Loop A Js Process That Dynamically Appends Hidden Divs ?

I'm trying to add some js automation to a blogging application I've developed for a wysiwig site builder program. This program doesn't allow php or any kind of server scripting, so everything has to be done with js. The basic set up is that a user enters a blog post in the application and the code below appends a comments div (which are already on the page but hidden by css) to the post:

Code:

Instead of using this code for every post instance, I'd like to create a simple loop that will assign an incremental number to the post and comments id's when a new post appears in the page's html, and then append a comments div to the post. I tried a for routine that would add 1 to every post, but couldn't get it to work right.