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function tse_scrollspy_link($string) {
  //Lower case everything
  $string = strtolower($string);
  //Make alphanumeric (removes all other characters)
  $string = preg_replace("/[^a-z0-9_\s-]/", "", $string);
  //Clean up multiple dashes or whitespaces
  $string = preg_replace("/[\s-]+/", " ", $string);
  //Convert whitespaces and underscore to dash
  $string = preg_replace("/[\s_]/", "-", $string);
  return $string;
}