Simulando OO em JS

gistfile1.js

function showNotice(){
    alert(this.level + " : " + this.message);
};

function notice(level,message){
    this.level = level;
    this.message = message;
    this.show = showNotice;
}
var notice01 = new notice("ERRO","Deu Merda...");
var notice02 = new notice("Warning","Vai dar merda...");
var notice03 = new notice("Confirm","Esta certo disso??");
	  
notice01.show();
showNotice.call(notice02);
showNotice.apply(notice03);