function person(firstname,lastname,age,eyecolor) {
	this.firstname=firstname;
	this.lastname=lastname;
	this.age=age;
	this.eyecolor=eyecolor;
	this.newlastname=newlastname;
}

function newlastname(new_lastname) {
	this.lastname=new_lastname;
}

myMother=new person("Sally","Rally",48,"green");
my=new person("Sally","Pieter",48,"green");