Use default installation profile?

Question

I've written a custom installation profile. When running install.php for the first time to install it, I have to select the installation profile I want to use. I then select mine and run the install profile, no problem. However, my client wants to be able to use the profile I put together as the default installation profile and skip that first step entirely (selecting an install profile). How can this be accomplished? Simply setting it as the default selected profile is not enough.