But when I go to view them on my iphone its just stuck on the first picture with no arrows to go through or anything.
It sounds like what you are describing is the Splash Page although I cannot check to see how your gallery is currently set up as the link you provided in your post above results in an error 403 (forbidden). (Please check the permissions of the files and folders on your web server. Default permissions of 755 for folders and 644 for files should be fine.)
The Splash Page is a placeholder for the gallery which is displayed by default on small screen devices when the gallery is embedded in a page (rather than displayed on a page of its own).
When the user taps 'View Gallery', the gallery is expanded to fill the user's browser window.
For more information about the Splash Page and how Juicebox adapts to different devices and screen sizes, please see here.
You can choose to not use the Splash Page by setting showSplashPage="NEVER" (in JuiceboxBuilder-Pro's 'Customize -> Splash Page' section).
Alternatively, you can force the gallery to be displayed in Large Screen Mode on all devices and in all browsers by setting screenMode="LARGE" ('Customize -> General').
If you choose to continue to use the Splash Page, you can customize it using the Splash Page configuration options.