function showRules(url) 
{
  var w=403;
  var h=600;
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  var settings  ='height='+h+',';
      settings +='width='+w+',';
      settings +='top='+wint+',';
      settings +='left='+winl+',';
      settings +='scrollbars=no';

  var win = window.open(url,'',settings);

  return false;
}

function showThanksPopup(url) 
{
  var w=403;
  var h=450;
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  var settings  ='height='+h+',';
      settings +='width='+w+',';
      settings +='top='+wint+',';
      settings +='left='+winl+',';
      settings +='scrollbars=no';

  var win = window.open(url,'',settings);

  return false;
}