Try the following:
Add this meta
tag in the head
of your HTML file:
<meta name="apple-mobile-web-app-capable" content="yes" />
Open your site with Safari on iPhone, and use the bookmark feature to add your site to the home screen.
Go back to home screen and open the bookmarked site. The URL and status bar will be gone.
As long as you only need to work with the iPhone, you should be fine with this solution.
In addition, your sample on the warnerbros.com site uses the Sencha touch framework. You can Google it for more information or check out their demos.