Need Help With Java Scrip

Okay I need some help with my site
I was in https://www.it-leaked.com untill that loser delted both my accounts for reasons i don’t know.
but when i was on the site.. I noticed on his right hand side page, that he had
Dashboard
Users (now when you clicked on users it would display how many users that are on the blog at that time. I was looking thru the code. he’s using show_hide.js wondering if there’s any coders out there to help me do something like this

All, I need is to have a text that says “users” and once you click it it would dissappear or drop down, and show how many people are browsing your blog

Second. he has a little neat thing called “Invite” you click on it, and a small text field drops down showing that you can invite other members, wondering how I could go about and throwing an invite system up there.

Thanks
dave