FBJS selector

var Element = {
    visible: function() {return (!this.hasClassName('toggle'));},
    toggle: function() {if (this.visible()) { this.hide();} else {this.show();}},
    hide: function() {this.addClassName('toggle'); return this;},
    show: function() { this.removeClassName('toggle'); return this;},
    remove: function() { this.getParentNode().removeChild(this);return null;},
    empty: function() {while (this.getLastChild()) { this.removeChild(this.getLastChild());}}
    }
function $(element) {
          
    if (typeof element == "string"){
        element = document.getElementById(element);
        if (element){ extend(element,Element);return element;}}
}

function extend(instance,fn) {
    for (var name in fn) {
        instance[name] = fn[name];
    }
}