Shift array left and right

function shiftRight(arr)
{
	var temp = new Array();
	temp.push(arr[arr.length-1]);
	for (i = 0; i <= arr.length-2; i++) temp.push(arr[i]);
	return temp;
}
 
function shiftLeft(arr)
{
	var temp = new Array();
	for (i = 1; i <= arr.length-1; i++) temp.push(arr[i]);
	temp.push(arr[0]);
	return temp;
}