var $ = function(selector, node) { // Bare-Bones Selector Engine
    var selector, node;
    selector = selector.trim();
    node = node || document.body;
    if (selector != null) {
        return Array.prototype.slice.call(node.querySelectorAll(selector), 0);
    }
}
 
Array.prototype.put = function(html) {
    for (var i = 0; i < this.length; i++) {
        this[i].innerHTML = html;
    }
    return this;
}
 
$('div').put('yay!');