function roicalc() {

  if(screen.width){
  var winl = (screen.width-635)/2;
  var wint = (screen.height-575)/2;
  }else{winl = 0;wint =0;}
  if (winl < 0) winl = 0;
  if (wint < 0) wint = 0;
  /*
  var settings = 'height=' + h + ',';
  settings += 'width=' + w + ',';
  settings += 'top=' + wint + ',';
  settings += 'left=' + winl + ',';
  settings += features;
  */
  win = window.open("/roi.asp","popup","left=" + winl + ",top=" + wint + ",width=625,height=560");
  win.window.focus();
}