I have made available a fully functioning Demo of Calendar Date Select, the Javascript based visual date selector plugin for rails:

Calendar Date Select Rails Plugin

Source and homepage: http://code.google.com/p/calendardateselect/

I have been using my own subclassed version of the Google Maps GMap2 class for some time now. Here is how I do it:

function extend(subclass, superclass) {
function Dummy() {}
Dummy.prototype = superclass.prototype;
subclass.prototype = new Dummy();
subclass.prototype.constructor = subclass;
subclass.superclass = superclass;
subclass.superproto = superclass.prototype;
}

function MyMapClass(DomElement) {

MyMapClass.superclass.call(this, DomElement);
this.enableScrollWheelZoom();
this.enableContinuousZoom();
this.mycustomattribute = [];

}

Then:

extend(MyMapClass, GMap2);

MMC = new MyMapClass(document.getElementById("map"));