function main() {    var d, l, p;    d = new Document;    p = new Pen(0,0,255);    d.addLayer("blah", p);    d.setActiveLayer("blah");    l = new Line(d, 20,20,100,20);    d.addEntity(l);    p = new Pen(255,0,0);    d.setActivePen(p);    l = new Line(d, 30,30,100,30);    d.addEntity(l);}