How to inherit from the DOM element class

Question

I want to write some Javascript classes which extend DOM nodes (so that I can then insert instances of my class directly into the DOM), but am having difficulty finding out

Answer 1

I've found a hack that works... at least, it enables me to access the extended object properties via the DOM element and vice versa. But it's hardly elegant.

var DOMelement = document.getElementById('myID'); // or  $('#myID')[0]; in jQuery
DOMelement.extended = new extensionClass(this);

function extensionClass(element) {
    this.element = element;
    ...
}