HTML:

<ul id="Items-container">
<li>1111</li>
<li>2222</li>
<li>3333</li>
<li>4444</li>
<li>5555</li>
</ul>

 

 

jQuery snippet:

var swapElements = function(siblings, subjectIndex, objectIndex) {
    var subject = $(siblings.get(subjectIndex));
    var object = siblings.get(objectIndex);
    subject.insertBefore(object);
}
$(function() {
    swapElements($('ul#Items-container > li'), 4, 0);  // swap 1st with fifth 
        // you can run multiple functions here like :
    swapElements($('div#otherContainer > p'), 2, 10); // swap 3rd with 11th    
});