Javascript inheritance and method overriding

You can simulate it like this:

SpecialWidget.prototype = {
    load: function(args) {
        Widget.prototype.load.call(this, args);
        // specific code here
    }
}

Or you can create your own super property like this:

SpecialWidget.prototype.parent = Widget.prototype;

SpecialWidget.prototype = {
    load: function(args) {
        this.parent.load.call(this,args);
        // specific code here
    }
}