How do I copy this optin form??
 

I don't understand the code that is running this optin form in 3 stages without refreshing the page?? how can I copy this for use on my own domain? what code or script is running this page?

http://www.maximum-leverage.com

It's using Javascript. But the code has been "obfuscated", which means, it's been made to be difficult to read by humans. You'll have to know what you're doing and break it down.