Inheritance Fortunately, most browsers now support the Object.create method. This method takes an existing object as a parameter. It returns a new object that has the existing object assigned as its [[Prototype]] . Even more fortunately, this method is quite easy to create for those environments that do not support it:

if(typeof Object.create !== "function") { 
     Object.create = function (o) { 
           function F() {} 
           F.prototype = o; 
           return new F(); 
      }; 
}  

var foo = { 
    name: "foo", 
    sayHello: function() { 
    alert("hello from " + this.name); 
    } 
};

foo.sayHello();

....

var bar = Object.create(foo); 
bar.sayGoodbye = function() { 
      alert("goodbye from " + this.name); 
} 

bar.sayHello();
bar.sayGoodbye();

Method Two for creating inheritance: extend

function extend(obj, props) { 
     for(prop in props) { 
            if(props.hasOwnProperty(prop)) { 
                  obj[prop] = props[prop]; 
             } 
     } 
}