Looping panels in ScrollView and setting innerwidth

Hi, I have 2 questions on ScrollView and need your advice...

a) Is there a way to loop a scrollview?
For example, I have a 2 panels in a scroll view, say "PANEL 1 | PANEL 2". Is there a way where when PANEL 2 is displayed, the PANEL 1 is attached to the right such that it becomes likes this:
PANEL 1 | PANEL 2| PANEL 1 | PANEL 2 ...

b) There is a "Horizontal ScrollView properties' that define the inner width of the scroll.
i) How do I define the width from my code?
ii) I noticed the width varies between different devices. Is there a way to dynamically assign the width such that the width is similar on all devices.

Thanks for the help in advance..

WZSun