function launchWindow(url, print_this) {
  window.open(url, "_blank", print_this);
}
function launchHeightWidth(form) {
  var urls = new Array();
  urls[0] = "print_this/model_release_p.html";
  var print_this = new Array();
  print_this[0] = "height=485,innerHeight=485,width=574,innerWidth=574,toolbar=yes,resizable=no,scrollbars=yes,left=20,screenX=20,top=40,screenY=40";
  var group = form.features;
  for (var i = 0; i < group.length; i++) {
    if (group[i].checked) break;
  }
  launchWindow(urls[i], features[i]);
}