bind.js

Function.prototype.bind = function(self) {
    var f = this;
    return function() {
        return f.apply(self, Array.prototype.slice.call(arguments));
    };
};

// e.g
var obj = {
    name: "hokamura",
    test: function() {
        alert( this.name );
    }
};

$("#test").click( obj.test );           //=> undefined
$("#test").click( obj.test.bind(obj) ); //=> hokamura