function xy_percent(n, m)
{
  if(m == 'x') {
    return (100 * n) / $(window).width();
  } else if (m == 'y') {
    return (100 * n) / $(window).height();
  }
}
function percent_xy(n, m)
{
  if(m == 'x') {
    return (n * $(window).width()) / 100;
  } else if (m == 'y') {
    return (n * $(window).height()) / 100;
  }
}