Hi, I finished my client's website months ago and now they are interested in displaying their website in a more simplistic form on the iPhone and mobile devices (cell phones and small screens.)

I am looking for a tutorial that would help me accomplish this. For starters, I just want to display a landing page ONLY for the iPhone that display simple information about their company and then a button that says "ENTER SITE" and it would continue them onto the full HTML site.

Any ideas on where I can learn more about this? Thanks for the help,