function moveFocusToIndex(idx, elements) {
			if (idx < 0) {
				idx = elements.length - 1;
			} else if (idx >= elements.length) {
				idx = 0;
			}

			if (elements[idx]) {
				elements[idx].focus();
			}

			return idx;
		}
Moves the focus to the specified index within the elements list.
This will scope the index to the size of the element list if it changed.

@private
@param {Number} idx Specified index to move to.
@param {Array} elements Array with dom elements to move focus within.
@return {Number} Input index or a changed index if it was out of range.