function RedDwarf(disc) {
  if(isNaN(disc)) {
    disc = 0;
  }
  if(disc != 0) {
    document.write("<h2>The Other Episodes</h2>");
  }
  if(disc != 1) {
    document.write("Red Dwarf I: The Original Series One<br>");
  }
  if(disc != 2) {
    document.write("Red Dwarf II: The Original Series Two<br>");
  }
}