var reverseList = function(head) {
	var previousNode = null;
	var currentNode = head;
	var nextNode = null;

	while(currentNode) {
			//reverse the pointers
			nextNode = currentNode.next;
			currentNode.next = previousNode;

			//move list forward
			previousNode = currentNode;
			currentNode = nextNode;
	}

	return previousNode;
};