Specifying object

context_man2.html

<button id='thebutton'>Click me!</button>

context_man2.js

function Person(name) {             
    this.name = name;             
    this.sayHello = function () {                 
        alert('Hello ' + this.name);             
    }         
    
}          
function addhandler() {             
    var p1 = new Person('Jason'),                 
    the_button = document.getElementById('thebutton');             
    the_button.onclick = p1.sayHello.call(p1);         
    
}          

window.onload = addhandler;