Function.prototype.bind = function(){
     var fn = this,args = Array.prototype.slice.call(arguments),object = args.shift();
      return function(){
              return fn.apply(object,args.concat(Array.prototype.slice.call(arguments)));
      };
};


var myObject = {};
function myFunction(){
    return this == myObject;
}
assert( !myFunction(),"Context is not set yet" );
var aFunction = myFunction.bind(myObject)
assert( aFunction(),"Context is set properly" );

var introduce = function(greeting) { alert(greeting + ",my name is " + this.name + ",home no is " + arguments[1]); }

hiBob(" 456"); // alerts "Hi,my name is Bob"
yoJoe(" 876");