// JavaScript Document
   var ancho = 80;
   var alto = 10;
   var fin = 310;
   var x = 100;
   var y = 100;

   function inicio(){
    ventana = window.open("banner.html", "_blank", " resizable,height=1,width=1,top=x,left=y,screenX=x,screenY=y");
    abre();
   }

   function abre(){
    if (ancho <= fin) {
     ventana.moveTo(x, y);
     ventana.resizeTo(ancho, alto);
     x += 5;
     y += 5;
     ancho += 15;
     alto += 15;
     timer = setTimeout("abre()", 1);
    } else {
     clearTimeout(timer);
    }
   }