Swap The DOM Node Positions?

I'm attempting to make it so it physically swaps the element position within DOM (the index, in other words) when someone clicks on a button. It will either be the element right before, or right after (depending on which button they click). I'm using jQuery, so if there is an easy way to do it using that, please let me know. If not, I can use jQuery to get the DOM elements using .get(). I don't know if I can just just do something like:

Code:

var domElements = $('.draggable').get();
var tempElement = domElements[index + 1].cloneNode(true);
domElements[index + 1] = domElements[index].cloneNode(true);
domElements[index] = tempElement;

It doesn't seem to work quite right. Should I use replaceChild or something? Don't know if it would work, here? I will know the index, so that's not an issue, here, it's just a matter of getting it to reorder the elements, so when I loop through them, they are processed in the correct order.