for laurus.js

//constructor for the MyClass class
MyClass = function() {
  //do whatever constructor logic you need, or just leave it blank
};

//creates a class-level function, which you can call via MyClass.loadThing()
MyClass.loadThing = function() {
  //do your loading thing
}

Ext.extend(Ext.grid.GridPanel, {
  loadThing: MyClass.loadThing
});

var myObj = new MyClass();
myObj.loadThing();