Help With Custom Buttons within the Application Studio

I'm trying to create an index page that plays a mandatory video that plays before a user can enter our website. I have been playing with the Application Studio and have created such a page and it works great!

When the video finishes I want a custom button for them to enter the website. I have figured out how to make the button appear but need to know what script I need to use to make it let them enter our website.

Here's what I have so far, now, how do I make it work. My test page is www.acousticalternative.com/test.php:

function customFunc1 (entryId){

//Place your script here

}