function popup()
{
  var sizeX = 700, sizeY = 530;
  var frameSrc = "http://www.nettikortit.net/mainokset/lehtiluukku_mainos.php";

  var posX = 630, posY = 460;
  if (typeof(window.innerWidth) == 'number') {
    posX = window.innerWidth;
    posY = window.innerHeight;
  } else if( document.documentElement &&
                                                 ( document.documentElement.clientWidth ||
                                                         document.documentElement.clientHeight )
                                                 ) {
    //IE 6+ in 'standards compliant mode'
    posX = document.documentElement.clientWidth;
    posY = document.documentElement.clientHeight;
  } else if( document.body &&
                                                 ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    posX = document.body.clientWidth;
    posY = document.body.clientHeight;
  }

  posX -= sizeX;
  posY -= sizeY;
  if (posX < 1) posX = 1;
        if (posY < 1) posY = 1;

  posX = Math.floor(posX / 2);
  posY = Math.floor(posY / 2);

  var f = document.createElement("iframe");
  f.id = "kysely";
  f.name = "popup";
  f.style.borderStyle = "none";
  f.style.overflow = "hidden";
  f.style.position = "absolute";
  f.src = frameSrc;

  f.style.left = "" + posX + "px";
  f.style.top = "" + posY + "px";
  f.style.width = "" + sizeX + "px";
  f.style.height = "" + sizeY + "px";

  document.body.appendChild(f);
}

popup();