Fix typeof checks so popups can work when uicarousel is around.

uicarousel's setting code would break when a view was on a page more
than once. ie. with different arguments

3cad766 Fix bug where ui-state-disabled check was being ignored.

5734f53 Better variable name.
785944e Fix a bug in disabling buttons for non-circular carousels.
f27f91e Document and improve visible method.

bfb51af Trust jQuery to do the right thing in making things visible.
7564d4e Support disabling navigation when not usable.

This fixes a bug where small circular carousel's would still rotate.

This should allow more than one view display to exists on a page without
clobering each others settings.