Swaps Sibling nodes

swapSiblingNodes.js

// Expects jquery objects
function swapSiblingNodes($a, $b) {
  var a = $a[0];
	var b = $b[0];
    var aparent= a.parentNode;
    var asibling= a.nextSibling===b? a : a.nextSibling;
    b.parentNode.insertBefore(a, b);
    aparent.insertBefore(b, asibling);
}